Depends on whether you are asking about a cheek piece or the peanut. German snaffle, elliptical or French link are examples of snaffle "bits". Fulmer, D ring, drop cheek, baucher, loose ring, eggbutt, 3ring (gag), etc are all cheek pieces.
Loose ring snaffle
D ring snaffle
Eggbutt, loose ring, double-jointed
Full Cheek Snaffle
(All can help with turning. Full cheek Snaffles are the most severe of the three.)