These hens are pretty much duckwing. The last one looks like a messy silver duckwing. Additionally, if you breed your rooster (assuming he’s duckwing) to the red/buff hens, then breed the offspring back to a duckwing-looking chicken, they should produce more duckwings.
It may be hard to do that as all of them have a mixed coloring, including the buff, which isn’t purebred. They will likely have recessive genes and leakage. If you just want a mostly duckwing/wheaten pattern, that’s not too hard to do. If you want them to match the SOP version of duckwing and...