Alegre (Bob Baker Marionette Theater, 1345 W. 1st St., L.A.,  250-9995). A south-of-the-border puppet and marionette musical revue. Thu.-Fri., 10:30 a.m.; Sat.-Sun., 2:30 p.m. Indefinitely. $8-$10.
Bill's New Frock (Asian Youth Center, 100 W. Clary Ave., San Gabriel,  309-0622, Ext. 114). A boy wakes to find that everyone thinks that he's a girl, in the Mark Taper Forum P.L.A.Y. production of an adaptation of Anne Fine's satire. "Gender stereotypes are given a hilarious trouncing in this family theater treat" (L.H.). Sat. only, 11 a.m. Free.
Children's Concert and Storytelling (Autry Museum of Western Heritage, 4700 Western Heritage Way, L.A.,  477-2929). Tales of Jewish cowboys and mountain music, with Bruce Molsky and Karen Golden. Sat. only, 1:30 and 3 p.m. $12-$18.
The Magic Mirror Players Children's Show (New Ivar Theatre, 1605 N. Ivar Ave., Hollywood,  660-5656). Raf Mauro's comedy improv show for kids. Sun., 10:30 a.m., noon. Indefinitely. $7.
The Patchwork Girl of Oz, Parts 1 and 2 (Alfred Newman Recital Hall, USC, 3616 Trousdale Parkway, L.A.,  740-2584). Louise Reichlin & Dancers' version of L. Frank Baum's story. Sun. only, 3 p.m. Free.
Pippi Longstocking (Haugh Performing Arts Center, Citrus College, Glendora,  963-9411). American Family Theatre. Sat. only, 1:30 and 3:30 p.m. $5.
The Princess and the Frog (Theatre West, 3333 Cahuenga Blvd., West L.A.,  761-2203). Storybook Theatre's comedy by Lloyd J. Schwartz, Hope and Laurence Juber. Ages 3 and up. Sat., 1 p.m. Ends July 13. $8-$10.
Puppetolio (Santa Monica Puppet and Magic Center, 1255 2nd St., Santa Monica,  656-0483). "Puppeteer Steve Meltzer's light but disarming musical puppet variety show" (L.H.). Ages 3 to adult. Sun., 1 and 3 p.m. $6.50.
Story Time Saturdays (Brown Brothers Building, 455 6th St., San Pedro,  217-7596). Flights of Fantasy theater show. Sat., 10 and 11 a.m. $3; two for $5; parents free.
Storyopolis Super-Sized Saturday (Storyopolis, 116 N. Robertson Blvd., A, L.A.,  358-2512). Junior Sleuths' & Mystery-Writers' Workshop," with Bruce Hale ("Chet Gecko, Private Eye"). Sat. only, 4 p.m. $6.
To Whom It May Concern (Santa Monica Playhouse, 1211 4th St., Santa Monica,  394-9779). A musical performed by children and teens. Fri. only, 1:30 p.m. Free, but reservations required.