I have been seeing some wacky looking Barred rocks on the Breed/gender page that are coming from big hatcheries, especially birds from TSC which gets most of their birds from Hoover’s.
So your boys are not cochin or Dominique cross.
Dominique cross= rose comb
Cochin cross= feathered feet
They could be a Barred rock mix or a maran mix. They look more BR IMO.