High pitched...

Can't really say there is a specific "reed cut" that'll get you there. After all, there are high pitch calls in every style cut there is from "cutter" to "split V". I can tell ya that thinner (prophylactic) reeds tend to be a lot higher pitched than thicker reed calls.

Try a MAD "High Ball" for starters... Heck, MAD makes a lot of high pitched mouth calls actually...