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They are a different species (Aythya fuligula), not the usual domestic ones (Anas platyrhynchos or Cairina moschata) https://en.wikipedia.org/wiki/Tufted_duck

I assume you mean the things sometimes called "ear tufts", that are found in Araucanas in the USA? When I read about chicken genes, the one for that trait is called "ear tuft," and the chicken calculator uses the abbreviation Et for it. That seems like a good way to keep from confusing it with...

In that case, he might have the crest gene, and just have a very small crest.

Yes, I agree with what the non-crested chick shows about the rooster.

If you want to know for sure whether he has the gene for crest or not, you could test-mate him to see. Breed him to some hens that have no crests at all (any of the common breeds or mixes that have no crest or tuft.) If he produces any crested chicks with those hens, then he does have the...