The Barkskin Furbolgs
Tyrande Whisperwind saves a furbolg shaman from corruption in the Barrow Deeps.
The Barkskin tribe of furbolgs are native to Mount Hyjal. They, along with the Shadowtooth trolls, fought alongside the orcs and humans under the command of night elves in the Battle of Mount Hyjal. Their fate after the Third War is unknown, though it is speculated that they survived and remain uncorrupted, and are often the basis of furbolg playable race rumors.
It is not known whether they bear any relation to the cave dwelling furbolgs that Tyrande saved from destruction in the Barrow Deeps under Mount Hyjal.