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

Derived forms: lowland burrowing treefrogs

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

Part of: genus Pternohyla, Pternohyla