Yep!
Select your plane, and open the Atribute Ed.
Click the Ocean Shader tab, and look through ALL of the attributes untill you find the one for "Wave Height".
It is a horizontal graph-like value.
Good luck!
(PS - you can always also do a search in the docs for "wave height" too.)
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS
izzylong.com