YOU THINK KIDS say the darnedest things? Listen closely to a few other children's musicians, and you just might change your tune. Here are our awards for the goofiest song lyrics of the recent past. *Best Diet-Destroying Sing-Along ''Crunchy munchy cookies/ Crunch, crunch, crunch/ Crunch, crunch, crunch/ Yum, yum, yum, yum/ Yum, yum, yum, yum'' (Paul Zims, ''The Kooky-Cookie Song''). *Most Convincing Ad for Martial Arts ''When you exercise/ Do not compromise./ Just feel the heat/ Of the karate beat!/ Hey, it's karate for kids!/ Karate for kids/ Hey, it's karate for kids!/ Karate for kids!'' (Kevin Anderson, ''Karate for Kids''). *Strangest Use of Pets ''Peter's little Pekinese in blowin' in the breeze/ See Suzy's little Siamese drip-drying in a tree'' (Norman Foote, ''Raining Cats and Dogs''). *Sincerest Ode to Shrubbery ''Tree, tree, tree/ We love you, yes we do'' (Mister Rogers, ''Tree, Tree, Tree'').





