Frogs are mostly amphibious, cats are most haters of water.
Cats will eat frogs, frogs will not eat a cat.
Cats purr, frogs do not.
They both have similar physiology. Hearts, blood, brains, nerves, etc.
Neither of them care much about what people think of them, except people seem to like cats and not frogs.
When eaten, they probably both taste like chicken.