Yes, and they are unique in this way, too. They produce teeth continuously. Their teeth are not set in sockets like those of other vertebrates but rather loosely and flexibly attached by tendons to their jaws. That is why shark teeth are the most abundant vertebrate fossil material on the Earth and in the sea. Scalloped hammerhead on the reef.
Several species do, including hammerheads and mackerel sharks.
Typically, pelagic sharks that never encounter the bottom are adapted to swim all their lives. So the answer is no, emphatically. There are even some sharks with spiracles, holes on the top of their head that allow water to enter their gill chambers when the mouth is on the bottom. Mouth of a hammer. Sharks have a unique, loose jaw suspension that allows them to raise their snout and loosen their jaw from the braincase, thrusting it forward so that, in effect, the shark has a terminal mouth right out there at the end.