[4] As a junior football player, he scored 13 touchdowns en route to a state championship and hit .500, drove in more than 30 runs and stole more than 30 bases for his travel baseball team.

He was also named the high school football Offensive Player of the Year in Georgia's smallest classification after rushing for 2,500 yards and 38 touchdowns.

[7] Considered a top prospect for the 2016 Major League Baseball draft,[8][9] the Cincinnati Reds selected Trammell with the 35th overall pick.

[10] He signed with the Reds and was assigned to the Billings Mustangs of the Rookie-level Pioneer League, posting a .303 batting average with two home runs, 34 RBIs, six triples and 24 stolen bases in 61 games.

[12] The Reds invited Trammell to spring training in 2019 as a non-roster player[13] and he began 2019 with the Chattanooga Lookouts of the Double–A Southern League,[14] and again appeared in the All-Star Futures Game.

[19] Trammell made his MLB debut for the Mariners on April 1, 2021 playing center field against the San Francisco Giants.

[20] Trammell collected his first hit on April 3, an RBI double (off Logan Webb) that scored Evan White, in the bottom of the fourth inning.

[24] He was activated off the injured list on April 30[25] and in his return, hit a grand slam off Chris Bassitt of the Toronto Blue Jays.