Once Upon a Snowman, on Disney+ (about 8 minutes)
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Note: I originally classified this as a "special", so that's where I have my entry for it. Since then I've come to think of it as more of a short film, but I don't feel like moving the entry.

There's not much to say about this without giving away the whole story. So, um... it debuted on Disney+ in October 2020. It shows the story of everything that happened to Olaf between being created by Elsa and meeting Anna and Kristoff. It's all rather amusing, and very... Olaf-y. I really liked it, and how it fits into the Frozen franchise. And I guess that's all there is to say.