Dusalk's Troll Clan Cave is located between Kazordoon and Venore, east of the Dwarven Bridge, you need a shovel to open the hole that is hidden behind a tree. This cave includes many Trolls so you can hunt here well as a lower level. But be careful there's a Minotaur Archer and a Minotaur Mage in the lower level of the cave that could be lured, even to the surface.
It also includes a grave with this inscription:
You read: Deraut kadet ul al cadert!
Herot kar Gurxat
Also, there you can find Daily Respawns of 12 Troll Green and other items, they're located on a small room filled with bugs and bats, west of the entrance.