I looked through the list of breeds:
https://www.hoovershatchery.com/hatcherychoicerare.html
He does not have a single comb or a rose comb, which rules out many of the breeds on the list.
I think he is probably a Prairie Bluebell Egger, or possibly one of the other -egger types.
https://www.hoovershatchery.com/prairiebluebellegger.html
Oof ok that's the one I found. I agree, that's what he most likely is, but he is very interesting-looking