Originally posted by Skylar:

Also they do hang around the caves (not always), unless you have kill the Troll inside. Than they stop showing up in the area around it.

They respawn inside, i have felt it. Was exploring a troll cave once after realizing there are some treasures like amber, pearls and rubies in there so i went back. Only while being in the back there it respawned on my face and smacked me around a few times before i barely made it out alive.