Crocodile and crocodile people

I think it would be cool if there were crocodiles. Since Mojang doesn't want to add any real hostile mobs so they could be neutral like the polar bear. I think there could be a new material called scales which crocodiles would drop. It would create a armour that is as good as diamond but turns you invisible (with the armour) when you are in water. They would also drop crocodile teeth which can craft a sword that does + 6.5. There would also be crocodile people these are a form of villagers that are only found in swamps and they protect themselves since they wouldn't have an iron golem.They would have trades better than villagers because there so rare. They would both be extremely hard to kill because they do high attack and have 30 hp and have an armour the same diamond. These would be so powerful so people wouldn't go hitting stuff carelessly.