alligatorfish

[al-i-gey-ter-fish]

noun, plural (especially collectively) al·li·ga·tor·fish, (especially referring to two or more kinds or species) al·li·ga·tor·fish·es.

a slender marine fish, Aspidophoroides monopterygius, of Atlantic seas, having overlapping plates covering the body.
any of several related fishes of the family Agonidae.

Origin of alligatorfish

An Americanism dating back to 1765–75; alligator + fish