So I've been playing in my friend's server for awhile now and we've noticed that for the past 2 winters the pengulls haven't appeared.
Steps to Reproduce
Played the game through a winter and a half and there are still no pengulls.
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.