They are supposed to be nasty deviants, yes? The intro implies this. Also they are ambitious and used to tunnel living.

Chief Muk Tukkish whips it out to take a piss in front of his people, and casually uses his schlong mid-stream to direct his three most nimble and healthy followers to explore the three tunnels ahead and report back. The remainder should stay put, conserve their energy, chew on the nasty fungi, and make cackling sounds like goblins tend to do.