Frogs breathe through their skin in air or water, but that's slow. If they need higher amounts of oxygen than their skin can provide, like if they're exerting themselves a lot or in water with less oxygen, they need their air-only lungs.
So frogs can breathe underwater and drown from lack of air, like some Schrödinger's amphibian.
But what does a frog need a diving suit for?
To breathe probably.
Frogs breathe through their skin in air or water, but that's slow. If they need higher amounts of oxygen than their skin can provide, like if they're exerting themselves a lot or in water with less oxygen, they need their air-only lungs.
So frogs can breathe underwater and drown from lack of air, like some Schrödinger's amphibian.