1. Terrestrial burrowing nocturnal frog of grassy terrain and scrub forests having very hard upper surface of head; of the United States southwest
   "The northern casque-headed frog uses its hard head to dig burrows";
   - lowland burrowing treefrog, Pternohyla fodiens

Derived forms: northern casque-headed frogs

Type of: tree frog, tree toad, tree-frog

Part of: genus Pternohyla, Pternohyla