What is dermal plicae?

The dorsolateral dermal plicae of the leopard frog are two pale, thickened bands of the dorsal skin extending posteriorly from each eye to the urostyle prominence While they are normally found in all areas of trunk skin, the largest ones are in the plicae

Explanation:

dermal plicae of the leopard frog are two pale, thickened bands of the dorsal skin extending posteriorly from each eye to the urostyle prominence. ... While they are normally found in all areas of trunk skin, the larg- est ones are in the plicae

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.