My hair is slow to grow if I don't take a vitamin for the growth. I take GNC nourishair for women.
A good conditioner will help with the tangles I bet. It sure helps mine. I use a gel that coats my hair to make it seem thicker and give it good hold.
As for frizz if a good conditioner and strong hold gel doesn't help that then Curl Keeper
by Curly hair solutions does a good job of getting rid of frizz. I hate the rest of their products but Curl Keeper
is really good.
Good luck finding what works for your hair!