My nearly 4 yr old grand daughter does this all the time! She makes up words, renames toys and animals with strange sounding words, and has an imagination as big as a country. She will line up 20 toy dinosaurs and then tell me their names, Mooco, Natcha, BooCo Meeky, Tala, Beekee,,and on and on. I just sit in awe of how she can do this. I told her M. some of the names and found out there are some cartoons for kids she has seen that actually have those names. So it wasnt so made up as I had thought. Be sure to get it on video so you can show him years from now how funny he was. Keep in mind they hear songs and words on tv, or wherever, and misunderstand them. Just today she asked me to sing the "Barbie" song. I didnt know what Barbie song she meant so I asked her to sing it once for me. I recognized it from some video. Its supposed to be a deep mans voice saying, "Come on Barbie, Lets go party", but she was saying Come on Barbie, echo potty" and laughing like crazy! She also says people who fly airplanes are "pirates" instead of pilots, and they live at the "airpork", instead of airport.. And when she spins in circles, she stops and says whoa, grama, Im "busy",,, I think in their young ears they just hear stuff different and then compounded by imperfect 3 yr old speech it just comes out this way. I for one, will miss all this cute funny mistaken stuff when she starts to learn the real words. )=