From “Common Errors in English Usage” by Prof Paul Brian’s-
A person is crowned, not coronated. “Coronate” is improperly derived from “coronation,” but “crown” is the original and still standard form of the verb. But don't be in too big a hurry to declare that there is “no such word”: “coronate” means “crown-shaped,” and has various uses in biology.31 May 2016
In Biology it is used to mean “having a corona or crown shaped pattern or colouring “ and as an adjective, not a verb.
So a bird ‘s plumage may be described as “coronate with blue feathers”.