A gallery of fresh faces spice major league rosters as the season opens this week.

Perhaps the team depending most on its rookies is the Detroit Tigers, who move into the American League season with the brand-new doubleplay combination of first-year men Lou Whitaker at second and Alan Thammell at Shortstop.

Both have come to the majors following impressive minor league seasons at Montgomery. Trammell batted 291 and Whitaker 280 there. The Tigers have so much confidence in the pair that they traded Tito Fuentes and Tom Veryzer, their second base-shortstop combination in 1977, to make room for the newcomers.

California made a similar move, unloading an established star outfielder, Bobby Bonds, to make room for rookie flash Ken Landreaux, the minor league player of the year. Landreaux batted 357 with 27 home runs, 116 runs batted in and 20 stolen bases with Angel farm clubs in El Paso and Salt Lake City last year.

Infielder Ted Cox, who can play third base or first base, was the key man for Cleveland in a six-player trade that sent pitcher Dennis Eckersley to Boston. Cox was the most valuable player in the International League last season when he batted 334 with 14 homers and 81 RBI with the Red Sox' Pawtucket farm club. He set a major league record for rookies with hits in his first six major league at-bats and hit .362 in 13 games when the Red Sox called him up last September.