the mud snakes can be found right out side of atla, if u walk ashore where Rognvald can be found and around where the Hobgobline snke finders are you shouldnt have a problem finding any mud snakes :)
I got a quest from her to talk to Amora. Apparently her daughter is sick and you need to kill five water snakes to get her healed. Problem is, I can't find any water snakes. If anyone knows where they are, I'd appreciate it.