Snails do have teeth that they use to eat, so in that sense, yes, they can bite. However, snails typically do not bite humans, and if they do, their jaws may not be strong enough to make much impact. However, there are some types of snails that are dangerous to humans.
The cone snail is a marine snail that can max out in size around 9 inches. With its characteristic cone-shaped shell and large size, it is relatively easy to identify, though it can hide under sand, using a siphon to breathe. The cone snail has a powerful venomous sting that can kill humans, though even this is technically not a bite.