Trolls are big enemies armed with clubs seen in Gauntlet: Seven Sorrows. They specifically appear in Imperial Dungeons ownards. One of The Six was transformed into a a bigger and stronger form of troll when he, like the other advisors attempted to gain immortality. He appears to lead the trolls and is located near the end of Dungeon Depths. The Imperial Guards and Trolls appear to be fighting each other.
There is also another type of enemy troll which carries a device on its back and explodes upon proximity to a hero, much like the Bomber.