Will the buccal fat pads return?

If you've had your buccal fat pads over resected, it is unlikely that weight fluctuation will change them. Fortunately, you can undergo filler treatments of fat transfer to replace the lost volume. Stephen Weber MD, FACSDenver Facial Plastic Surgeon

A pleasant day to you.  Buccal fat pad removal is an option to decrease the appearance of chubby cheeks.  Once removed that fat does not return.  Other options to slim the lower third of the face include neurotoxin treatment to masseter muscle, weight loss or liposuction.