Triprion

Triprion or shovel-headed tree frogs is a genus of frogs in the family Hylidae. They live in Mexico and Guatemala. They live on the Pacific side of the mountains (west side), the Yucatán Peninsula, and Guatemala. These frogs hide in tree-holes and put their bony heads against the opening of the hole to close it.
Species.
Scientists say there are three species in this genus: