But the ship that Anna and Elsa's parents took was the ship in The Little Mermaid. And wasn't Little Mermaid, like, thousands of years after Frozen? Nice theory, but you need to read some other theories first.
Some fans say that the song is describing Elsa because of her ice powers and it can be true. But when one remembers Anna’s statement to Hans at the near end of the movie, "The only frozen heart around here
Hans theory from frozen completely expained<<if Hans did love Anna, do you think if he actually kissed her the spell the trolls put on him would break? Almighty with Anna's frozen heart? Idk, but I really like this theory