Palumbo joins Taylor Hearn as the second prospect to receive the call this season.
The left-hander is the club's seventh-best prospect, according to MLB Pipeline. He's spent the entire season with Double-A Frisco and hasn't recorded a win or a loss in 10 starts. He has a 3.38 ERA and a 1.28 WHIP in 50.2 innings.
105.3 The Fan's Jared Sandler recently spoke to Palumbo. You can hear the interview below.