What kind of chicken is this??

[Babychicks2020]

She has a mohawk.
I also have a light yellowish chicken that I'm not sure what she is. And then I have a chicken who is brown and white.

 

[NatJ]

Those crests make me think of Cream Legbars, but the color of the chicks isn't right for that breed.

Maybe Olive Eggers? They're often created by crossing Cream Legbars with some dark-egg breed, so they often have the little crest or mohawk but come in various different colors.

Where did you get the chicks?

Chicks from a hatchery or store will often be pure breeds or specific recognizable crosses, while chicks hatched from the eggs of someone's backyard flock are much harder to figure out.