Pics of Armored Troll followers? And how do they work? Seriously, that is my driving force right now.
You hire them for 500 gold from a DG NPC, and they follow you around and take up your "pet" slot, similar to Stray Dogs and Barbas. They hit like trucks, have ridiculous health, and are overall really strong. I believe they cap around level 40 or 50, though, so a higher level character won't have them scale all the way up. They respawn endlessly as well, and if you have them wait around too long sometimes they'll just leave you.