Frog body sections.

Head and mouth. Frogs have two nostrils, two tympanic or eardrums, and two eyes. Each eye has three eyelids: one of them is invisible. This third eyelid, also called the crooked membrane, protects the frog’s eyes when it swims underwater and helps keep the eyes moist when the frog is on land. There are four separate teeth inside the frog’s mouth that help the frog catch and swallow prey.
Paws. Frogs have five toes on each webbed hind foot and four toes on their front feet, which are not webbed. During metamorphosis from a tadpole to an adult frog, the hind legs develop more than the front ones. This is in part because the frog begins its life in the water, and the webbed hind legs become more useful.