[PleasantlyFascinated]

Other than the typical exercise such as squats, lunges, etc. Are there specific natural supplements you could take to help you grow your ass or butt. Just ass growth no breast growth.

Nope.  I'd have to say not.  Female hormone shift will grow your boobs as much as butt.  I've tried topical estrogen on butt and hips for just as you say, and it grew my boobs as well anyway.

Maca might help your butt, but then you will probably get belly fat as well as boob fat.

Weight training is the only way that I've found.