From The Collaborative International Dictionary of English v.0.48 :
Crappie \Crap"pie\ (kr?p"p?), n. (Zool.)
A kind of fresh-water bass of the genus Pomoxys, found in
the rivers of the Southern United States and Mississippi
valley. There are several species. [Written also croppie.]
[1913 Webster]
From WordNet (r) 3.0 (2006) :
crappie
n 1: small sunfishes of the genus Pomoxis of central United
States rivers
2: small sunfishes of central United States rivers