what kind of feed are they on? Medicated?
Cocci will show up through feces (bloody), and is very contagious.
If it is cocci and they have not been on medicated starter, then you could start with changing the feed, but also you will need to treat the cocci with sulmet in their water.
Hopefully someone can give you more info and dosing instructions.
Good Luck.
Maybe posting a pic of the feather loss too could be helpful.
I know frizzles can be pretty wacky looking when they are young....but just incase.