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Probably not a frog (unless he is soaking in your tub too)..but a toad. That's a good thing, he will eat bugs around your tub
Don't bring him in..he is doing just what he is supposed to do out there under your tub. All that stuff that you are cleaning up is the remains of tons of bugs that could be pestering you as you soak in your tub..Ha..I love my Marquis spa frog. ..and you love your spa toad. ..you do right?
The rubber duck..is a must however