That is considered a defect on a turkey. Sometimes it is genetic, other times related to nutrition. What level of protein do you have the turkeys on? They need much higher protein than chickens for proper plumage development.
I probably would if I were you. I would recommend mixing it with the lower protein feed, so not to shock their system by changing it suddenly. Keep them on it a couple extra weeks (up to 8 weeks old) and they should recover fine as they go through some more moults.