Naruto as crocodile summoner?

Wondering if people can help me with this, there was a fanfic I read ages ago which involved Naruto signing the crocodile summoning contract. I'm pretty sure it was one where he was getting training before the third round of the chunin exams, and I think there was one of the seven swordsmen involved in the training, but I might be wrong about that.

I've been looking around, but the closest I've found was the one where he gets Zabuza's sword, ends up dating Mei after the second round and signs the shark contract, but I'm positive it was the crocodile one in this story (or possibly alligator?). I've got a vague recollection he was using a weapon with crocodile teeth as a blade, but that might be way off

Thanks for any help you can give!