From WoWWiki

Frostmane Hold is the base camp of the Frostmane ice trolls located in the cold mountains of Dun Morogh. The hold is comprised of a few buildings and a cave system, all heavily guarded by troll headhunters and hideskinners.

Frostmane Hold lies in the mountains south of the entrance to Gnomeregan, and young dwarves and gnomes are tasked to explore the caves and report back to Kharanos, in order to determine just how big a threat the trolls are.

Subzones of Dun Morogh

Amberstill Ranch • Anvilmar • Brewnall Village • Chill Breeze Valley • Coldridge Pass • Coldridge Valley • Frostmane Hold • Gates of Ironforge • Gnomeregan • Gol'Bolar Quarry • Gol'Bolar Quarry Mine • The Grizzled Den • Helm's Bed Lake • Iceflow Lake • Ironband's Compound • Ironforge • Kharanos • Misty Pine Refuge • North Gate Outpost • North Gate Pass • Shimmer Ridge • South Gate Outpost • South Gate Pass • Steelgrill's Depot • Thunderbrew Distillery • The Tundrid Hills