The size of waves on alien worlds will depend as much on the characteristics of the liquid as well as the gravity.

'Tall waves moving in slow motion': Here's how oily oceans on Saturn's giant moon Titan may behave

Source: space
Source Link: https://www.space.com/astronomy/saturn/tall-waves-moving-in-slow-motion-heres-how-oily-oceans-on-saturns-giant-moon-titan-may-behave