You guys were spot on with the meaning. It’s not that the potion reveals their true versions and turns them into frogs its that when she’s on the date and she’s not feeling it, she uses the potion to turn them into frogs, “cause she keeps finding wrong ones again and again” She also leaves the ending up for interpretation, like “maybe every frog you see out in the wild is a guy she dated and turned into a frog cause they weren’t the ones?”