A frog can levitate if it has a
strong magnetic field
below it.
This is possible because the body of the frog behaves as
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Frogs can levitate because they have a high water content, which is a good diamagnetic material.
The ground creates a very large electric current to create an extremely strong magnetic field which magnetises the frog in such a way that its magnetisation is in the opposite direction to the applied field. This means that the frog is pushed up from a region of high magnetic field into one of lower field, and levitates.