Lizards have teeth, too, even vegetarian lizards like green iguanas. Some snakes have stingers in their tails. No snakes have stingers in their tails. Some have hard skin on their tail tip that may be due to a variety of reasons, such as unshed skin or new scales emerging as the snake is growing. Some burrowing snakes may have a hardened tip on their tail that they use to push against the ground to give them some leverage as they burrow new tunnels.
Some snakes are vegetarians.
No snake is a vegetarian, nor do any snakes eat vegetation. All snakes are carnivores, with diets, depending on species, ranging from arthropods, other invertebrates, fish, amphibians, reptiles, birds, or mammals. Some snakes are cannabalistic and will eat other snakes, including members of their own species. All snakes have to eat live prey. In the wild, snakes do not eat carrion.