Frohnapfel has two years of eligibility remaining.
"Over the course of my career, I've been really hoping for this. I'm glad I have the chance to start my first college game," Frohnapfel told masslive.com. "It'll be my first start, so there's a certain pressure there. But it's something I've been excited for for a long time."
Frohnapfel completed 35 of 45 passes for 386 yards and five touchdowns in 17 games over two seasons with the Thundering Herd.
UMass, which went 1-11 in 2013, opens the 2014 season Aug. 30 against Boston College. The Minutemen were picked to finish last in the MAC East Division in a preseason media poll.
- Chris Johnson