He may live in a pineapple under the sea, but he's no slacker when it comes to veggies. Starting this month, parents will have help encouraging their little ones to eat foods that are good for them. Nickelodeon stars such as SpongeBob Squarepants will make their debut on packages of spinach and baby carrots in the grocery stores nationwide. Dora the Explorer, and Sportacus and Stephanie from the Nick Jr. series LazyTown also will appear on baby carrot packages from Grimmway Farms, Inc. Boskovich Farms will feature SpongeBob on its bags of spinach. And, LGS Specialty Sales, distributors of oranges, tangerines and clementines, will host characters such as SpongeBob, Dora, Blue's Clues and The Backyardigans on bags of fruit. Nickelodeon characters also will appear on cartons of lowfat milk once upcoming deals are finalized, according to a news release.