One time though i came across a bunch of tiny frogs about that size and so i caught 5 or so and just discreetly held them in my hand as I wandered over to the kids. As usual, they started chanting “Magic. Magic. Magic,” wanting me to perform for them.
This time i started my normal routine but when it came time for the reveal, the coin had disappeared but in its place was 5 tony frogs that all leapt from my hand as I shouted “Frogs” in their native language. The kids all screamed and ran away.