The Terps will wear athlete-designed stickers on their helmets on Saturday.
Paul Bin, William James Herve and Brayan Padilla were sidelined for much of 2019.
“More than the Score” aims to offset the financial losses of the COVID-19 pandemic.
The Terps circulated a picture on social media kneeling in solidarity against police brutality and racism last week.
The son of Kenyan immigrants, Ngobu played for various club teams in Maryland before coming to College Park.
It also pledged to work toward playing fall championships in the spring.
Turner racked up 24 catches for 294 yards and one touchdown across his four years in College Park.
The German started 18 games, and was an all-Big Ten second team selection in 2019.
All three are ranked among Inside Lacrosse's top 40 recruits in their class.