There could be. However, the quality may vary greatly. You might have to dig through a lot of fanfics to find one that really does justice to the idea of Naruto and Tsunami having a relationship. It depends on how the author interprets their characters and the story they want to tell.
Well, 'naruto tongue tsunami fanfic' could potentially be a creative and out - of - the - box fanfiction. It could be that an author had this wild idea of combining Naruto's world with a really strange concept like a 'tongue tsunami'. Maybe it has something to do with a new character who has a special ability related to their tongue that can cause a tsunami - like destruction or transformation. It could also be a humorous take on the Naruto universe, where the idea is just for comical purposes.
Family is a very common theme. Since Tsunami is adopting Naruto, it explores the idea of creating a new family unit. Another theme is healing. Naruto has a lot of emotional scars, and in these fics, Tsunami often helps him heal.
One common theme could be the 'opposites attract' concept. Naruto is a boisterous and determined ninja, while Tsunami is a more calm and ordinary village woman at first glance. Another theme might be about Naruto bringing a new kind of excitement into Tsunami's life.
One common theme is the overcoming of differences. Naruto is a shinobi with a big destiny, while Tsunami is a civilian. Their relationship in these fanfics often involves bridging this gap.
A 'naruto marries tsunami fanfic' might start with Naruto arriving in Tsunami's village. He might initially be there on a mission. Tsunami would be impressed by Naruto's courage. As they spend more time together, they start to understand each other on a deeper level. Naruto's dreams and Tsunami's love for her home could be common ground for their relationship to grow, and eventually lead to marriage.
One popular 'naruto tsunami fanfic' could be 'Tsunami's Hidden Strength'. It shows Tsunami in a new light, with her having some unexpected abilities and playing a more crucial role in the Naruto universe.
You could start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'naruto tongue tsunami' on their search bars and see if any relevant stories pop up.