Cuckoo is a color pattern. It might of been them being puffed up of wind. But are a few breeds that a Cuckoo, they look a lot like Barred but it is kinda all over instead of lined (uniformed).
I agree that they look like pullets. They also look to be 2-3 months old. The Barred one looks more like a Cuckoo, but could feather out better after her first molt.