Yes, there is alot of squat mobility which address different problem areas.
Do you have 130 degrees of hip range of motion?
If not, need to improve hip flexion.
Is your back overextended when you squat?
Have you watched the episodes, M|WOD Pro, or Daily M}Wod that address the butt wink?
A couple to start with.
Coaching Buttwinkers | Pro Episode #77
Pro Episode # 27 – Butt Winking Is NOT ok. Ever. (So don’t you even think it.)