Some burrowing frogs such as Couch 's spadefoot ( Scaphiopus couchii ) have a flap - like toe extension on the hind feet that helps them to burrow .
A flap - like toe extension on the hind feet is a keratinised tubercle often referred to as a spade .
Some burrowing frogs such as Couch 's spadefoot ( Scaphiopus couchii ) have a flap - like toe extension on the hind feet , a keratinised tubercle often referred to as a spade , that helps them to burrow .