This cute hat can be made with or without the teeth (directions for both options are included). One could also attach the dorsal fin onto the back of the dress instead of on the hat. This would also work in colors to reflect a dolphin or a whale!

Gauge for larger needles:
7.5 st x 11 rows per 1” stockinette

Gauge for smaller needles:
9 st x 14 rows per 1” stockinette