Horned Toad, also called Horned Frog and Horned Lizard (Phrynosoma cornutum), is really a lizard belonging to the Agamidae (q.v.). It is found in Mexico, Texas, Oregon, and California.
Horned Toad,
Chambers's Encyclopaedia, Volume 5: Friday to Humanitarians, p. 782
Source scan(s): p. 0799