Blackmaw tribe

The Blackmaw tribe is a furbolg tribe residing in Blackmaw Hold in northwestern Azshara, at the former location of the closed entrance to Timbermaw Hold. The Blackmaw tribe is fighting against the goblins of the Bilgewater Cartel.

They were in talks with the Alliance, however agents of the Horde were able to turn two groups against each other.

This tribe broke off from the Timbermaw tribe, it's unknown exactly why.

Speculation
It is possible that the Blackmaw is made up of furbolgs who wish to save the Azshara from the goblin's activities.