Crossodactylus is a genus of frogs in the family Hylodidae.[1][2] The genus occurs in Brazil, southern Paraguay, and northern Argentina. These frogs are sometimes known as Limnocharis, Tarsopterus, Calamobates, and by the common name spinythumb frogs.[1][3] They typically inhabit streams in mountainous areas in the Atlantic Forest or in montane savanna.[4]