spade toad

from The Collaborative International Dictionary of English v.0.48

Spadefoot \Spade"foot`\ (sp[=a]d"f[oo^]t`), n. (Zool.)
   Any species of burrowing toads of the genus {Scaphiopus},
   esp. {Scaphiopus Holbrookii}, of the Eastern United States;
   -- called also {spade toad}.
   [1913 Webster]