Brown is the fifth defensive back to join the Nittany Lions' highly touted 2022 recruit class.
Stoll has served as Penn State's starting long snapper since 2019.
Stout had an impressive final season in Happy Valley by handling nearly all of Penn State's special team duties.
The 25-year-old quarterback has made stops with three different NFL teams.
"This past year didn't end the way I had expected, and I look forward to pursuing the goals we have set out as a team, as well as the goals I have for myself."
Stacy Collins, who spent the 2021 season as Boise State's special teams coordinator, will fill the same role with the Nittany Lions.