No. Spencer Tracy is not in the 1970 movie Tora! Tora! Tora! Maybe you’re referring to James Whitmore (played the role of Admiral William F. Halsey) who bore a resemblance to actor Spencer Tracy.
See full cast of the movie on IMDb.
Born on April 5, 1900, in Milwaukee, Wisconsin, Spencer Tracy starred in film classics like Father of the Bride, Inherit the Wind, Judgment at Nuremberg and Guess Who's Coming to Dinner. He frequently collaborated with actress Katharine Hepburn, with whom he was romantically linked. Tracy ultimately received nine Academy Award nominations, winning for Captains Courageous and Boys Town. He died in Beverly Hills, California, on June 10, 1967.
See Spencer Tracy’s filmography on IMDb.