''I have naturally curly hair.'' With those fateful words, <i>The Complete Peanuts</i> introduces another main character to the gang, the vain Frieda (not to mention her cat Faron). Also in this volume, which collects two full years from the early 1960s - one of Schulz''s most fertile periods - Sally begins to grow up, Snoopy endures an avian family crisis, Linus develops a crush on Miss Othmar and loses his blanket again (when Lucy turns it into a kite and then lets it fly away), and more baseball routs. Aaaugh!!