Bridge troll

King's Quest I
This troll was the guardian of the gnome's islet located in Daventry. He requested treasure from whoever wished to visit the island. But Graham tricked him by taking the goat towards him. It is generally known that goats hate trolls, so the goat knocked the troll of the bridge into the River Fools. He probably drowned in it's raging currents.

King's Quest IV
A troll lived in the caves behind the waterfall in Tamir. Rosella had to traverse the troll's caves to reach the swamp where the Magic Fruit grew.

King's Quest VII
Trolls live in the Vulcanix Underground, in the land of Eldritch. They are ruled by King Otar Fenris III. For a while Rosella herself was converted into a troll