Yup. Mint will do that. I have it in pots all over as well as an old plastic kid swimming pool i buried to keep it contained.
I think its cool how toddlers can learn to find the mint and basil to chew on. I make extremely sure they know the specific places that have what they can try but kids use their sniffers. “Granny, this one smells good,” meaning of course they’ve found it in a different pot and want some. The buried kiddie pool is where “their” mint is but even when they’re real little they find the other locations.
I only have one grand, but it was the same with him, when he was little.