WordNet sense 1 (a disdainful grimace):

moue, wry face

WordNet sense 2 (be in a huff and display one's displeasure):

brood, sulk

WordNet sense 3 (marine eellike mostly bottom-dwelling fishes of northern seas):

eelpout

WordNet sense 4 (catfish common in eastern United States):

hornpout, horned pout, Ameiurus Melas

WordNet sense 5 (make a sad face and thrust out one's lower lip):

mop, mow, mow