Basic Anatomy Defined
Shark's mouths vary by species in size, shape and functionality.
For example the Cookiecutter Shark has a suction producing structure of lips and jaws. This allows the Cookiecutter to attach to it's prey while it swivels around cutting a circular plug of flesh. The Great White Shark has a large mouth which gives it the appearance of a huge grin. Enclosed within this mouth are powerful jaws that can produce up to four-thousand pounds of pressure per square inch. The upper jaw projects upwards and outwards as it bites into it's prey.
Tongues: Yes, sharks do indeed have tongues although they don't always look exactly like what we expect. These fleshy areas and the lower mouth have numerous taste buds that work along with the olfactory system, very similar to human taste buds.