5 Questions About the Frozen Storyline on Once Upon a Time

Elsa's frigid journey through Storybrooke leads us to Mr. Gold's shop, where he has Anna's medallion, so the obvious question is, how did he get it? Did Anna and Gold have a run-in in the Enchanted Forest? We're looking forward to the Frozen characters actually interacting with Once characters (and not just being terrorized by giant snow monsters).