ANGUS, THINGS, AND FULL FRONTAL SNOGGING, Griffin Theatre Company. Christina Calvit’s cheery adaptation of Louise Rennison’s best-selling novel is high-energy and fun–and best suited to the young teens who are Rennison’s devoted readers. Georgia (Katherine Nawrocki) is a goofy, smart-alecky 14-year-old English schoolgirl who sharply observes and questions the rituals involved in getting and keeping a boyfriend. She’s surrounded by chaos: her father (Matthew Lon Walker) lost his job and has taken a new one in New Zealand; her mum (Katie Jeep) might be having an affair with the interior decorator (also played by Walker); her best friend, Jas (Sara Hoyer, who’s perky but with an edge), is crazy about a boy (Kevin Kingston); and Georgia’s cat, Angus (Paul S. Holmquist), is tearing up everything he can get his claws on, including neighbors’ pets.