Martin was a two-time All-American with the Gators.
Parnham will travel out west to the Denver Outlaws.
The captain was selected by the New York Atlas.
Juric is the fourth and latest member of the Nittany Lions' recruiting class.
Misa scored 34 goals in 67 games last season in the OHL.
The winner of the Nittany Lions' game against the Raiders will face the winner of No. 4 seed Ohio State against Notre Dame.