Well, it's possible that such a fanfiction exists. Elsa and Jack Frost are from different fictional universes (Elsa from Frozen and Jack Frost from Rise of the Guardians), but in the world of fanfiction, people often cross over characters and create all kinds of scenarios. However, I haven't personally come across a 'pregnant' fanfiction involving them. You might have to search on some dedicated fanfiction websites to find out for sure.
Yes, there are some. You can find them on various fanfiction websites. Some are really creative, imagining how their different powers would interact in a relationship and how they would rule their combined kingdoms in a unique way.
One common theme is the exploration of their powers. Since both have powers related to ice and snow, fanfictions often delve into how their powers can combine or contrast. Another theme is friendship or romance. Many writers like to imagine them as friends or lovers.
Yes, there are some fanfictions with this theme. You can find them on various fanfiction websites like Archive of Our Own (AO3). However, this is a very creative and often out - of - canon concept that fans have come up with.
One possible way their love story could be in fanfiction is that they meet by chance. Maybe Elsa is exploring the frozen forest and Jack Frost, with his mischievous nature, decides to play a little trick on her. But instead of getting angry, Elsa is intrigued by his carefree spirit. They start to communicate more, sharing their experiences of being in control of ice and snow. As time passes, they realize they have a deep connection, and their love begins to grow.
Imagine Elsa and Jack Frost cross paths. Elsa is intrigued by Jack's ability to control ice in a different way than she does. But then an evil force emerges that targets both of them. To protect Elsa, Jack sacrifices himself. Elsa is left all alone, mourning for the friend she just found. She blames herself for not being strong enough to save him, and she returns to Arendelle, but with a heavy heart filled with sorrow for the loss of Jack Frost.
There might be such fanfictions. Some fanfic writers enjoy creating crossovers and exploring unusual relationships in their stories. They might write about Jack Frost and Elsa in a pregnant situation to add an interesting twist to the story. But it's important to note that these are fictional interpretations not related to the official storylines of either character.
One possible plot could be that Elsa and Jack Frost meet by chance in a magical realm that bridges their two worlds. They fall in love quickly. Then Elsa discovers she is pregnant. They have to hide from the forces in their respective worlds that would oppose their union because of the pregnancy and the implications it has on the balance of magic.
One possible plot could be that Jack Frost, perhaps out of loneliness or a misunderstanding, kidnaps Elsa. He takes her to his icy realm. Elsa is initially scared but then realizes Jack has his own insecurities. They start to talk, and Elsa, with her power over ice, shows Jack new ways to use his powers. Eventually, they become friends and Jack realizes his mistake and returns Elsa to Arendelle.
Common themes include power - sharing and the building of a new kingdom. Given their ice - based powers, they could create a utopia of ice. There's also the theme of family acceptance. How would Elsa's sister Anna react to her marrying Jack Frost? And how would the guardians (if Jack Frost's backstory with the guardians is considered) accept Elsa? These relationship - based themes add depth to the fanfiction. Also, many fanfictions play with the idea of the seasons and how their union might affect the cycle of nature, like creating a perpetual winter that is both beautiful and not harmful to their people.