The Barkskin Furbolgs are a group of uncorrupted furbolgs that inhabited in the Barrow Deeps beneath Mount Hyjal at the time of the Third War. They and the Shadowtooth trolls, fought alongside the orcs, humans and night elves, in the Battle of Mount Hyjal. Their fate after the Third War is unknown.
Rumors & speculation
They are often the basis of furbolg alliance playable race rumors, speculating that they survived and remain uncorrupted. The furbolgs that Tyrande Whisperwind saved from corruption in the Barrow Deeps under Mount Hyjal could be Barkskin Furbolgs indeed.