Generally, lizards have only one head. Their body structure is similar to that of other reptiles, consisting of a head, trunk, limbs, and tail. Some lizards may have some special body structures, such as the neck fan of the lizard, but they still only have one head.
It should be noted that in some myths and legends, some lizards are described as having two heads. But this is just a fictional storyline and has no connection with real creatures.