Bigger is not necessarily better when it comes to frog jumping. A gang of giant African superfrogs leaped and lunged into the second day of the 62nd annual Calaveras County Fair and Jumping Frog Jubilee Friday without coming close to breaking the distance record set by an ordinary American bullfrog. "We didn't break the record and, yes, I'm disappointed," said Seattle animal importer Andy Koffman, who claims the frogs can cover more than 30 feet in a single bound. But Koffman remains optimistic that his African frogs will stop flopping and start hopping in time for Sunday's championship. Representatives from the Guinness Book of World Records will be on hand in the tiny Gold Rush town to watch the green giants try to smash the fair's record, set in 1986 by Rosie the Ribiter, a born-in-the-U.S.A. bullfrog that jumped 21 feet, 5 3/4 inches.