http://www.sciencemag.org/news/2018/06/these-frogs-walk-instead-hop-video-reveals

Frogs and toads jump, swim, climb, and even glide. But four strange species of amphibians have evolved a decidedly unfroglike characteristic: a preference for walking. Now, scientists have discovered how they do it.

The Senegal running frog, the bumblebee toad, the red-banded rubber frog, and the tiger-legged monkey frog don’t walk like dogs or other four-legged beasts. Instead, they crawl low to the ground like a cat creeping up on prey.