C.W. Hart Jr. with a Crayfish, by Minor-Penland, Laurie, 1994, Smithsonian Archives - History Div, Natural History curator C.W. Hart Jr. poses with a crayfish, or if you prefer, a crawdad, crawdaddy, crawley-fish, crawcrab, crawpappy or mudbug, to name a few from the crawfish dictionary he authored to sort out crayfish names from those of lobsters, crabs and shrimp..