I am unique

Some have asked me how I can tell Pit Crew, one of my Grey tree frogs, apart from the rest of his siblings. Well they all have different markings. You can see by this pic, and the others of Pit Crew I posted, that gray's have cryptic markings. Those are all different and unique on every frog. Some are even solid gray or even green! I just took out Pit Crew b/c I didn't have the time to get the others out to get pics of yet.