Question

How does a frog locomote in the water?

Answer 1

In the water the webbed hind feet provide a greater surface area for pushing backwards on the water. The smaller fore-limbs help to steer when the frog is swimming and absorb the shock of landing after a jump on land. On moving from water to land or over rough ground the frog will crawl rather than leap.
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Answer 2

Explanation:

Locomotion. The frog's powerful hind legs are adapted for both swimming and leaping. ... The thrust is transmitted through the body of the frog by the pelvic girdle and the spine so that the whole animal is pushed forward. In the water the webbed hind feet provide a greater surface area for pushing backwards on the water.