A frog or toad. Used in Trinidad and Tobago in the Caribbean (and maybe elsewhere) - pronounced 'crappo' (emphasis on the 'a'). The word is probably of French origin. The small variety of frog that lurks on walls and can jump really far is known as the 'flying crapaud'.
Girl: Oh me lawd oi, look a flying crapaud up there!!
Guy: Relax yourself.