Hey there,
I agree with everyone who said don't give up hope yet. It can be so hard to be sure as they grow if they're pullets or roos.
How old are they? That could be a big help in everyone helping to sex them.
Also, don't forget that commercial egg laying breeds can have large combs even at a young age (not always, but it does happen). And they sure seem to have hen feathers so far...so maybe there's still a chance?
For Example, the Silkie in my avatar-----99% told me that it was a GIRL, in fact its a Rooster, and has fathered all my silkie chicks so far this year. ;-)
Take Care,
Bill.