Mole hole is "Maulwurfsloch" in German (mole - Maulwurf, hole - Loch) although we more often refer to the more visible part of the mole´s construction work as "Maulwurfshügel" (Hügel - hill).
When you google both German words, you will notice that there are far more results für Maulwurfshügel than for Maulwurfsloch. But since you are looking for a translation for your user script, "Maulwurfsloch" would be correct.