Horned lizards are the North American lizard genus Phrynosoma, often called “horny toads” or “horntoads” even though they are reptiles, not toads. The names come from the horn-like spines on their heads and their flattened, rounded bodies and blunt snouts.
There are 21 species, 15 of them native to the United States; the Texas horned lizard is the largest-bodied and most widespread. Several species can squirt an aimed stream of blood from the corners of their eyes, up to about 5 feet, to deter predators, and some collect rainwater along their skin channels to drink.
Source: Wikipedia: Horned lizard