It’s actually called Mist Haven. As for why the Enchanted Forest is called that, I have no clue.
I think Misty Haven was the land Elsa and Anna’s mother hailed from, and then later someone changed it’s name. Sorta like how our countries were renamed from something else way back in the day.
I think Anna has high connections with Shepherd David….what if she’s the one to teach him about true love, like Regina taught Snow about true love.
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"If you go as far as you can see...you will then see enough to go even further." - Finn Balor