A primitive term for "leader", Moggs are usually the strongest of a tribe of misfit monstrous humanoids. Strength does not make a great leader, so many Moggs lead their followers into ruin. Some Moggs however, are quite clever.
Anyone who kills the current Mogg automatically becomes Mogg. Squimothy became Mogg of a small tribe of humanoids in the Savage Hills of Mahogan after displaying the former Mogg's head to the survivors.