There might be. The world of fanfiction is vast. There could be a creative writer out there who has combined the Naruto universe with the events of Infinity War. However, it would be quite a unique and perhaps a bit of a niche concept. It's not something that would be super common, but with the creativity of fanfiction writers, it's definitely possible.
Well, Naruto characters have unique abilities. For example, Naruto's shadow clones could be used for various strategies. Sasuke's Sharingan could detect hidden threats. They could join the Avengers to fight against Thanos. Maybe Naruto's Rasengan combined with Iron Man's repulsor technology could create a super - powerful attack.
Perhaps Naruto finds a way to travel back in time and prevent Kushina's death in the first place. He could use his Sage Mode or some other special ability to manipulate time. And then, by changing the past, he effectively'revives' her in the present. In the Naruto universe, there are all kinds of crazy powers, so time - travel isn't completely out of the question.
Well, in this fanfic, maybe Naruto's chakra is mistaken for an Infinity Stone - like a new, unknown power source. The Avengers, being intrigued, try to understand it. Meanwhile, Naruto, upon learning about Thanos' plan, decides to use his Sage Mode to track Thanos down. He teams up with Iron Man, and they come up with a plan that combines Naruto's ninjutsu and Iron Man's technology to take on Thanos and his minions.
If Naruto were to watch Infinity War fanfiction, it would be a wild mix of two very different universes. Naruto is all about honor, friendship, and the pursuit of being a great Hokage. Infinity War has its own themes of sacrifice and the fight against ultimate evil. Naruto might be shocked by the large - scale destruction in the fanfiction. He could also be inspired by the way the Avengers come together from different backgrounds. He might even start imagining if he could form a similar kind of coalition in the ninja world to deal with threats that are too big for one village to handle.
One possible plot could be that Naruto discovers an Infinity Stone during one of his missions. Maybe it was hidden in an ancient ruin. This stone gives him new powers, like the ability to control time briefly. With this new power, he tries to prevent some of the past tragedies in the ninja world, such as the Uchiha massacre.
Well, in this fanfiction, perhaps the Infinity Gauntlet is brought into the Naruto world by a mysterious portal. Naruto, being the curious and brave ninja he is, picks it up. He might initially struggle to control the stones' powers as they are different from chakra. But as he learns, he could use it to unite the shinobi clans in a way never seen before, like using the Time Stone to show the clans the history of their pointless feuds and convincing them to work together for a better future.
He could potentially learn the Flying Thunder God Technique. It's a very powerful jutsu that Minato was famous for. Naruto's already fast with his Sage Mode and Nine - Tails Chakra, and this would make him even more formidable in battle.
He could potentially be a demon. Demons in the Naruto universe often have unique powers and appearances, and Naruto's connection to the Nine - Tails could be a starting point for such a transformation in fanfiction.
If Naruto became an Ino fan due to Kyuubi's influence, he might gain some mental fortitude. Ino is good at mind - related jutsu, and Naruto could learn from her how to better protect his mind from enemy attacks. Maybe he'd start to develop a form of mental shielding similar to Ino's techniques.
He could potentially gain an enhanced understanding of wood - style techniques. Since Hashirama was a master of it, Naruto might learn how to create more complex and powerful wood constructs, like huge forests for both offense and defense.