Mottled light greys or whites could work for your Kroot (going for a snow owl sort of look) given their pseudo bird like ancestry.
Drawing from other similar arctic/antarctic animals might help, such as an arctic fox, seals, reindeer, penguins or puffins (black and white with some yellow blended in), or other similar creatures. They'd give you some good palette ideas for the Kroot at least.
For your vespid tying in the turquoise somehow might look good and keep them different than the Kroot.
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