Frogs and other amphibians can definitely get oxygen from air and water
across their skin, though the amount diffusing across their skin often does
not support a high rate of metabolic activity. Frogs are generally very
dependent upon their lungs for most of their oxygen requirements, though
frogs that hibernate under the ice get all the minimal oxygen they need from
the water directly into capillaries.
The statement: "All frogs start life as aquatic tadpoles, breathing
underwater through internal gills and their skin." is, of course, grossly
inaccurate. A pretty significant proportion of the world's frog species do
not have free-living tadpoles - they are direct developers hatching from
their eggs as froglets. This is extremely common in the tropics.
Cheers,
Bryan
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