Mouth call and box call.   Because of my narrow palate, I have to use a mouth call youth frame for the hen calls.  But for gobbler yelps I can use a triple reed regular frame and get 2-3 decent yelps.  Not much volume, but it works.  With a box call, I can get a deeper and louder yelp at the beginning of the paddle stroke.  Takes some practice, but lighter pressure on the paddle produces the right sound.