No, we're not looking for the animal that goes "ribbit". Regarding horses, what's a "frog" refer to?

Answer The triangle of tissue on the bottom of the hoof

On the bottom of a horse's hoof, you'll find a triangular frog-shaped patch that covers about a quarter of the area. This is known as the "frog." If the horse is standing on soft footing, the frog should touch the ground, as it works as a shock absorber.

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