Not that I'm proposing anything here from Papyrus's point of view, but I'm sure it'll come up sooner or later...

So we have Creatures With Antlers (and too-human knees) eating the reindeer and chasing humans who happen by their sight. And we have a bunch of ready-made corpses stored in the Snowmen. Do the reindeer eaters show any interest in eating the frozen corpses?