I would guess barred-rock on the top photo (black chick w/ white dot on head). Then the one that is wildtype (stripes on back) I would say probably speckled sussex (if white legs) or welsummer (if yellow legs) depending on the leg color. Or if they have fluffy cheeks (hard to tell in the photos) then they would be easter-eggers. Even if no fluffy cheeks, they could be easter eggers. If you can get a close-up of the face/head, you can tell what type of comb they have too (sussex or wellie would have tiny straight combs, or EE would likely have a tiny pea comb - looks flatter against the head on babies). The others in solid color are hard for me to guess, since I don't have many buff or red birds. Maybe production reds (or NH or RIR).