The Nittany Lions recorded multiple hat tricks in its upset over the Terrapins.
The 6'6" guard played in 66 games at VCU, averaging 3.7 points and 2.1 rebounds per game in two seasons with the program.
Gratton's younger brother Dylan remains as a Nittany Lion.
Johnson will reconnect with former Penn State hoops head coach Pat Chambers at Florida Gulf Coast.
Mature at-bats and a united pitching staff pushed Penn State to victory Tuesday night.
With the pair of losses, the Nittany Lions now boast a lowly 2-9 record in the Big Ten.