Yes, there are quite a few. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Tyler Joseph Jenna Black' and you'll find a variety of stories. Some might be based on their real - life relationships, while others could be more fictional scenarios created by fans.
There is indeed. Fanfiction.net is also a great place to check. However, the quality can vary a lot. Some fanfictions might focus on the emotional connection between Tyler Joseph and Jenna Black, perhaps exploring how they support each other in different situations. Others could be more about adventures they might have together in a fictional world. It really depends on what you're into.