horned lizard

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several lizards of the genus Phrynosoma of western North America and Central America, having short horns on the head, a wide flattened spiny body, and a short tail.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of some 14 species of lizard in the genus Phrynosoma, generally with wide toad-shaped bodies less than a foot long, noted for the horny structures on their heads.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun insectivorous lizard with hornlike spines on the head and spiny scales on the body; of western North America