Frozen Swan

Frozen Swan is the Femslash ship between Emma Swan and Elsa from the Once Upon A Time fandom.

Season 4
A Tale of Two Sisters

White Out

Rocky Road

The Apprentice

Breaking Glass

Family Business

The Snow Queen

Smash the Mirror

Fall

Shattered Sight

Heroes and Villains

Season 3
THERE'S NO PLACE LIKE HOME
 * Emma and Hook accidentally bring Elsa's urn back to the present with them

Fanon
Although not considered a rare pair, shipping the two isn't common either. Those that do ship it are drawn to the closeness that the two shared during season 4. Shippers also enjoyed that Emma had a friend outside of her family. Elsa's kindness to Emma in the first half of the season was also a welcome contrast to Regina's cruelty towards Emma. Shipping died down after Elsa leaves during the mid-season finale of season 4, but there are those who still ship it. Shippers were very upset at the lack of acknowledgement to Elsa's time on the show post her leaving. Especially with how close she got with Emma.

Frozen Swan is sometimes seen as a third option for shippers. Instead of shipping Swan Queen or Captain Swan many could ship Emma with Elsa. Although given that Elsa is only in the first half of season 4, there were very few ship battles between the pairing and other ships.

The ship is the most written pairing for the Once Upon a Time version of Elsa. For Emma, who is shipped with many other characters, it is either fourth or fifth.

Fandom
AO3