Skum

In the Dungeons & Dragons fantasy role-playing game, the skum is a fish-like aberration. It resembles an ugly, black/dark green fish-humanoid, with muscular limbs, hands and feet which are both webbed and clawed, very veiny and tight-packed flesh, a tail, and fins protruding from the head, tail and, underarms.

The skum lives in watery grottoes and caves in broods of two to five individuals or packs of six to fifteen. As its name suggests, it is a rather scummy creature and could be described almost as an underwater equivalent of an ogre or minotaur. They speak Aquan and are lawful evil in alignment.