They are from Tractor Supply, so don't expect them to grow full crests. So far, they look like Cream Legbars even though some do not have a crest, and like @NatJ said, they may have other genes. Which is very possible with where they came from.
Hazel only lived five months, so I'm unsure of how...
Your birds are definitely Cream Legbars, Bielefelders are not supposed to have crests.
My Cream Legbars from Tractor Supply were bantam-sized as well. I purchased four, but three died and the last one-Hazel-was the sweetest thing ever. She did not seem to have any sense of fear. You can see her...