Frogs are amphibians, which means that they can live both in water and on land. There are more than 6,000 species of frogs, and they can be found on every continent except Antarctica. Frogs can range in size from less than an inch to more than a foot long. The largest frog in the world is the Goliath frog, which can grow to be more than 13 inches long and weigh more than 7 pounds.