Well, they are definitely all coturnix (AKA pharaoh, Japanese, stubble, etc.) The first is 'A&M' or a cross there of. Second looks like a female Golden, from the patches of spots extending from the shoulder. The third is either a brown or a jumbo, depending on adult size, but likely a brown if it's growing at the same rate as the others? I'm honestly debatable on that ones sex, I see ruddy on the breast that's close to the amount my males had at the "Mohawk" stage like that so I am inclined to say male but would be able to tell better once more head feathers come in.
They're very nice looking birds, such a funny stage when they're mostly feathered out like this. Cool to watch them grow out.
Cheers,
Jessie
