Larsson will be back in Binghamton after scoring a goal and adding an assist during a seven-game tryout at the end of the 2018-19 season.
Ament was named a first team All-American while Mac O'Keefe and Chris Sabia earned second team honors from Inside Lacrosse.
Cagle's resignation will take effect on May 31, but a national search for the 11th head coach in program history will begin immediately.
It was a strong all-around performance by Penn State in several events at this year's Big Ten Championship in Iowa.
The Nittany Lions dominated UMBC on their way to the first NCAA tournament victory in Penn State men's lacrosse's long history.
Emily Kaplan joined sports personalities from around the country on Friday's episode of "Around The Horn."