National Polio Poster Boy, 5-year-old Tommy Woodward of Baltimore, takes a heaping spoonful of baked beans the Massachusetts State Grange will serve in a statewide series of baked bean suppers for the March of Dimes Jan. 14. All 310 Granges are expected to take part, serving 15,000 pounds--or 30 million--beans. One of the largest dinners will be in Stoneham at 5 p.m. with 1000 attending. Herschel Newsome of Washington, D.C., national master of the Grange, will be a guest.