@TomSpilker's excellent answer to How (the heck) do they know some lakes on Titan are 100 meters deep? says at the very end:
As far as the lakes (smaller than the seas) go, as the sources you cite state, the last close Cassini flyby of Titan used this technique to measure depths of some of these lakes. Some researchers had proposed that the lakes are considerably shallower than the seas. This experiment put an end to that idea!
Are there both "lake" and "sea" designations on Titan? Officially or otherwise?