I settled on Goblin Scourge as the new name for my goblin offshoot. Here's the map I drew that got me to thinking about them. As you can see the brown, 'dead' areas. They move into areas and the destruction begins. As you can see a chain of farming villages are protected by the river...for now.
The gray lines within the dead areas are the earthen fortification. Scourge goblins are masters at building these structures.
I'll try to write up something for a post tomorrow, to stat them.