Cutaneous respiration
The skin of amphibians is a major site of respiration in all species for which measurements are available. Cutaneous respiration is the sole respiratory mode of lungless salamanders (family Plethodontidae) which lack lungs entirely yet constitute the largest family of salamanders. Cutaneous respiration in frogs and other amphibians may be the primary respiratory mode during colder temperatures.
Amphibious caterpillar
These caterpillars don’t have gills or anything that covers the trachea to operate marine mammals' surface-to-breathe technique for respiration. Instead they appear to absorb oxygen directly through pores in their "skin" from the enveloping water. The caterpillars require flowing water to provide sufficient oxygen. They spin "silk" tethers to attach themselves to the downstream sides of rocks to keep from washing away.