A frog is an amphibian insect that has moist skin and is adapted to live both on land and in water. Frogs have short legs, and they use their long, powerful hind legs for jumping. They are found all around the world, and there are over 30,000 different species of frogs. Frogs play an important role in the ecosystem as both predators and prey, and many species have developed unique adaptations to survive in their habitats.