frog swims upside down

It is highly unusual for a frog to swim upside down. While some species of frogs are capable of swimming, they typically swim right-side up, using their powerful hind legs to propel themselves through the water. If you observe a frog swimming upside down, it may be a sign of illness or injury, and it would be best to seek the advice of a veterinarian or wildlife expert who can assess the situation and provide appropriate care.