Frogs cannot breath underwater once they have become adults and shed their tadpole gills. They breath oxygen through both their skin and their lungs.
Frogs actually can breathe underwater, but not with their lungs. Frogs will often hibernate underwater or buried in the ground, during which they will take in oxygen that is in the water or soil through their skin.
When frogs are still tadpoles, they are able to breathe underwater through internal gills and their skin. Once they become adults however, they lose this ability, and cannot breathe underwater. They breathe air through their lungs and can also breathe through their skin, with tiny blood vessels, capillaries, under the outer skin layers.
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