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"Frog" like die chip on the beaver's tail.

I see your 'frog', but a bit hard to tell what it is from the photo. Does it stand out or is it recessed? From the photo it could be anything including struck through grease to PMD. That it might look frog-like is guaranteed to be accidental.

It is an accumulation of die chips, so it stands proud on the tail. Because the water was right there, and it sort of looked like a frog....I thought it would have jumped on the tail for a free ride, haha!

Your interpretation is hilarious, bet that has happened in true life!