Well, I decided to make this thread to put together a tactical consideration of Throgg and his altered Warriors of Chaos Army List as no one else has seemed to do this. So, I'm going to run through the choices for his list (excluding special characters as I find them subjective).
Chaos Lord - I know a lot of people don't like the Chaos Lord, because he's really expensive. And I have to agree. 100 points more for a point more in a couple stats over Exalted Hero? I'd rather spend my points elsewhere, especially in a Troll King army as your troops can get quite expensive.
Sorcerer Lord - An interesting lord choice - a must if you want to dominate the magic phase. Level 4 mage with the body of a chosen is nice, + the decent wounds characteristic means he's there to stay. As for lore choices, I've found nurgle to be the best. It has quite a few deadly numbers, such as spell #1 on the list - a must have for elite unit killing. Lore of fire could serve you well, especially with the Flaming Sword spell if you're put into CC. Shadow and Death also have some good options to consider. Marks to consider would be Tzeench or Nurgle. Since I favor Nurgle's spell list, I'm going to have to say nurgle, but the +1 casting bonus from Tzeench is nice as well. However, when considering a sorcerer lord, you really have to ask yourself whether the position could be filled with a regular Sorcerer of Chaos. They're nice, but expensive.
Daemon Prince - Has the same problems as the Chaos Lord - Way too expensive!!! I mean, yeah, if you're playing 3,000 points, a Daemon Prince would be killer, but in anything less, leave the model at home. Troops will win you games, not some uber-polished Daemon.
Throgg, Troll King - The centerpiece of this army list. He not only makes Trolls core choices, but he's a killer all on his own. For under 200 points, you get a super troll with even better strength and tougness. On top of that, his Vomit ability is D6 instead of 1, and he has the super-regeneration w/ eye of the gods bonus just like the other trolls. His leadership abilities to Trolls and Ogres are just the cherry on top. Even in armies that aren't playing with trolls as troops, he should be considered as a strong choice.
Exalted Hero - While an amazing choice in any Warriors of Chaos army list, the Exalted Hero doesn't shine as much in a Troll King list. If you plan on bringing mortals along with your trolls, he's definitely a strong candidate for leading them up. Good leadership and a variety of ways to put him together means he really can be tooled to whatever you need.
Sorcerer of Chaos - You need at least one of these in your list, and probably two or three in a 2000 point list. Magic is quite deadly nowadays with Dark Elves, High Elves, and Empire. You need some protection for your guys, and if you bring enough, swing the winds of magic in your favor. For mark and lore advice, go up to the Sorcerer Lord entry.
Trolls - This is the staple of the army. With Throgg, they're core and a must have. At first glance, Trolls may seem boring. More expensive ogres with no options and regeneration. But if you look at them, they're an amazing toolbox unit. Fighting a bunch of rank-and-file lackeys? Use their normal attacks, you'll mow them down with quantity and strength. Fighting some elite super-troops? Vomit all over them, and don't worry about having to hit or them passing on armor. At S5, you'll most likely wound anyways. And they're magical, just in case you wanted to hit etherials with it. That's just their offensive capability.
Now, on to their regeneration. A 50/50 shot of shrugging off every wound they take is quite impressive. And since they have no armor, you'll rely on it a lot. But the best part is that unlike armor, it can't be reduced to a lesser chance of survival. On top of that, if they make two or more regenerations in a given turn, you get a roll on the Eye of the Gods table. Good times.
There's only a few downsides to Trolls, but you really have to be careful about them. One - they're expensive. And while they can still get their licks in after a hard charge, don't expect them to take everything your opponent throws at them. Set up charges with bait units and careful movement. Secondly, stupidity is a killer. Make sure that you have some high leadership character nearby ao keep order with your trolls. Better yet, have Throgg join a large unit of trolls (either 5 or 8) for a deadly unit.
Chaos Warhounds - These are a godsend. Dirt cheap and faster than your trolls, these make excellent bait. Run them in units of 5 up ahead of your trolls to screen. Then either pull them out and hit with the trolls for a nice 'bait and switch' or even let them die, they're so cheap. A must have in a Throgg list.
Chaos Marauders - Marauders are probably your best choice if you want to include some humans in your list. The fact that they're extremely inexpensive and are easy to put into blocks of 20 makes them a good choice to balance out trolls. If you're willing to spend a couple extra points for Shield and Light armor, they're solid light infantry units that can supplement the trolls. Get a Standard Bearer and Musician for CR, champion if you've got some points to waste. As for marks, I'd stay away from Tzeench and Khorne - they're too instable for your marauders. Nurgle is nice with the -1 to hit from shooting/ -1 to ws for opponents, and Slaanesh makes your guys hard to put on the run. It's a big cost for a cheap unit, but if you're going to run a unit of 20, it's nice to have a bit of insurance on them.
Chaos Warriors - They're nice, hard-hitting units, but they don't run well with the Troll King. They're too expensive if you're running trolls, an not good enough. If you want a spearhead unit to run an Exalted with, take Chosen. For 3 points more, they're a much better escort.
Marauder Horsemen - They're an interesting alternative to Chaos Warhounds. Being twice as expensive, they don't do well as bait, but they can pack a punch and hold up enemy units for your trolls to make a devastating flank charge. Really a preference unit.
Special Choices -
Chosen - Expensive, but powerful. The only time you should take these is if you want something to go with your nifty foot slogging Exalted. Personally, I think it detracts from the fun of this army to run this, but a viable variant. The roll on the Eye of the Gods table is worth the three points almost all the time (Unless you get a 2). The extra weapon skill is pretty good too. They have toolbox choices like Marauders or the Chaos Warriors, with Halberds and Shields the best way to go.
Forsaken - Meh. I haven't used these guys because I think they're too random. In my opinion, if you're shelling out that many points per model, you might as well get Chosen. But who knows? You opponent may underestimate them, and you roll a 3 on the D3 attacks and slaughter. It's a bit random and unreliable.
Chaos Chariot - I like this special choice. It's even faster than your trolls and is a clear threat to the opponent. Slam one of these babies into the middle of their line, and just tear them apart with your other units the next turn. A bit expensive in my opinion, but they have a devastating potential.
Ogres - Now, there's a difficult choice here. Either use these Ogres in the WoC list, and be able to give them marks, or go the Ogre Kingdoms list and get them w/ bull charge and a larger equipment list. I think that the clear choice is the Ogres already in the book. Great Weapon and Chaos armor is a deadly combo for being just a bit more expensive than a troll. On top of that, giving them marks just makes it better. Here, I would say either Khorne or Nurgle are your best picks. Khorne if you don't care where they go, and just want a wrecking ball, Nurgle if you want them to last. (John Wayne II)
Dragon Ogres - Sure, they're more expensive than Ogres, but they're faster, have better WS and Ld, and they can get those sweet strength 7 attacks on the charge. They're worth their weight in gold if you are going against a Knight heavy list or a list with lots of big, gribbly things. (John Wayne II)
Chaos Knights - They're always a strong pick, but in a Troll list, you've already got fast heavy hitters. If you really feel the need for speed, go for them. They've got a lot of high strength attacks and can get marks. Once again, Khorne or Nurgle. Khorne is a dangerous way to go, but if you use them judiciously, they are a devastating sight to behold.
Rare Choices -
Chaos Spawns - Chaos Spawn are Unbreakable. This means they can potentially hold a flank on their own, something even Trolls can't manage. A little bit slow but nonetheless they're quite good. (John Wayne II)
Scyla Anfingrimm - Like Chaos spawns. But I'd rather take 2 chaos spawns then him, just for the damage output. 2d6+2 S4 attacks or d6+2 s5 attacks? I'll let you choose.
Chaos Warshrine - I don't admittedly have much experience with this. It seems very promising, but you have to consider that the trolls will already be receiving a multitude of Eye of the Gods rolls. If you want to beef up another unit such as Ogres, Marauders, or Chosen, then go for it. I'm just worried that it's a bit too expensive.
Hellcannon - Our only really Long-Range weapon. Nice artillery with a cool misfire table. In a Troll list, you're already moving very fast, so this isn't really as good. You don't have much better to do with your rare choices, but there's a multitude of other ways to use your points.
Dragon Ogre Shaggoth - Big, fast (for chaos), and hits targets like a freight train. However, it's too expensive. If you do want to use him, give him a Great Weapon. Strength 8 is just wonderful on them.
Giant - Giants are GREAT, specially the Chaos variant. This can keep up with your main fighting blocks, it's a great fighter, is Ld Stubborn (so it can hold a flank on its own, like the Spawn) and it's a Terror Cause, which is great if your going against anything that is not ItP or Slaanesh. The best marks are the MoS (Strike First Stuff Down pants always brings out the lols) and the MoN (a Giant's great weakness is shooting, the MoN helps it reach the enemy lines AND it helps him out in combat). (John Wayne II).
If you're looking for inspiration for a Troll King model, then heres a great thread from the Fantasy Project Section: Troll King Project
And that's all I have so far. I'm going to go into tactics later, but I've already spent so much time on this. If anyone is interested in contributing, feel free. This is a really cool way to play, and it would be great if we established a tactica for it.