I've noticed in the Wild Update that - since the frog variants are coded based on temperature - the white frogs end up spawning in the swamps and mangrove forests. Personally, it just feels really weird. They stick out like a sore thumb, and don't match at all.
Even in the promotional material, they show the brown frogs in this biome.
Why not make it match the color palette of the biome, and not it's temperature?? It really drags down the atmosphere of the mangrove swamp, which was what I was most excited about in the update.
"Realism", whatever that means in a game featuring bees the size of turkeys. One RL example of white(ish) frogs is the cuban treefrog, but actually it isn't even native to places where mangroves are found, and the most ironic thing is that it would fit in mangrove swamps if only mangroves would look like RL mangroves, which bark is often light gray (https://i0.wp.com/wilderness-society.org/wp-content/uploads/2019/11/mangroves-105646.jpg) - it doesn't help how the biome surface is mostly covered in dark gray goo either, while RL mangrove forests look so much better with all those white trees growing directly out of the water and almost no ground is visible.
It's not about how it "feels", because you're only feeling what's "right" depending on only camouflage, but that's not the case for some species. There are frogs that are instead adapted to temperature conditions, like light-coloured to reflect heat from the sun in humid or tropical environments, or dark-coloured to absorb heat from the sun in arid or frigid environments. The frogs in MC are designed and named after temperature: warm, temperate, and cold. It's just similar design to how some real-life frogs exist/live. Reality and wildlife is a lot stranger and seemingly illogical the more you notice them, but there are scientific reasons for why they are what they are.