What in the world is a Horned Frog?

Well it turns out that a horned frog (technically a lizard) is a real animal. So TCU or Texas Christian University's mascot is correct here is a Wikipedia article to explain.

Horned lizards (Phrynosoma) are a type of lizards that are a genus of the Phrynosomatidae family of lizards. The horned lizard is popularly called a "horned toad," "horny toad," or "horned frog," but it is neither a toad nor a frog. The popular names come from the lizard's rounded body and blunt snout, which make it resemble a toad or frog. (Phrynosoma literally means "toad-bodied.") The spines on its back and sides are made from modified scales, whereas the horns on the heads are true horns (i.e. they have a bony core). There are 14 species of horned lizards in North America, 8 of which are native to the United States. The largest-bodied and most widely distributed of the U.S. species is the Texas horned lizard (P. cornutum).