Griffin, the No. 1 overall draft pick of the Los Angeles Clippers in 2009, was an unanimous choice with 29 first-team votes, while Wall, of the Washington Wizards, had 28 first-team votes and one second-team vote.
Griffin, who missed the entire 2009-10 season due to injury, scored 22.5 points per game, pulled down 12.1 rebounds per game and filled highlight reels with his assortment of dunks. He was the first rookie to appear in an NBA All-Star Game since Yao Ming in 2003.
Wall, who entered the NBA after one season of college basketball at Kentucky, ranked seventh overall in assists with 8.3 per game and finished second to Griffin in rookie scoring with 16.4 points per game.
Fields shot 49.7 percent from the field and 39.3 percent from 3-point range, helping the Knicks return to the NBA playoffs.
Cousins pulled down 699 rebounds, the most for a Kings rookie since the franchise moved to Sacramento, and scored 14.1 points per game.
Neal, who helped spark the Spurs to the NBA's best regular-season record, shot 45.1 percent from the field and 41.9 percent from 3-point range.