My 7 year old nephew remembers all their names, too. As we walk around the barnyard, he points them out to me.
Him: "Hey look, there's Treck. And over here is Carmel and Ruffle."
Me: "How can you tell them apart?"
Him: "If you look close, you can see that Ruffle is a little bit fluffier. Oh, there goes Blackie. And those ones are Tony, Tuffy, and Sparky."
We peer into a pen that has 1 hen, and 5 rooster chicks. One of them strains his neck and begins to crow. It sounds awful. Nothing like a real rooster crow. He sounds like he needs to clear his throat, I think.
Just then my nephew comes over. "Oh, that's Scuffy, the pubert rooster," he says.