Nice video, I should have done the same when I made my guide as my group was hellbent in finding a Tetra for our guide and we went through some 319 total caves on 4 maps before we found one lol.

In short, we found 1 liquid lake and 26 frozen lakes in 319 frozen caves. I'd say these lakes are more rare than maypoles by a long shot since these lakes do not exist on every map.