The Bug:

Sometimes frogs can jump over things onto heights that will damage them, eventually leading to death if left in an area that allows for this.

I'm unsure of the specifics, but from my observation if a frog has to jump over something, especially something like a fence or wall, it wont take into account the height in which it will be falling from and take damage.

The build in the video showcases how there are scenarios in which this can happen.

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They also seem to be able to jump randomly with no blocks in the way and it up jumping too high, causing fall damage, as indicated by this clip of a youtube video I found:

https://youtube.com/clip/UgkxCeXVRBmcFxRIvvhBJ725TnkZRmPH8X6O

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The videos below are important to watch as they showcase the environment and scenario win which this bug can occur