aplodinotus grunniens

Webster's Dictionary (GCIDE)

1.One who croaks, murmurs, grumbles, or complains unreasonably; one who habitually forebodes evil. [1913 Webster]

2.(Zool.) (a) A small American fish (Micropogon undulatus), of the Atlantic coast. (a) An American fresh-water fish (Aplodinotus grunniens); -- called also drum. (c) The surf fish of California. [1913 Webster]

Note: When caught these fishes make a croaking sound; whence the name, which is often corrupted into crocus.