Looks like 16. Here are all of them from coaches twitter:
Neven Sussman, QB from Sherwood HS (MD)
Eli Mencer, RB from Altoona HS (PA)
Zach Lucas, DL from Old Tappan (NJ)
Devin Williams, OL of Washington HS
Dean Grogg, DL from Morristown Beard HS (NJ)
Isaih Clarke, WR from TC Williams (VA)
Nick Griffin, DL from Shaker HS (mid-year signing)
Zee Roberson, WR from East Stroudsburgh (mid-year signing)
Will Brunson, QB from Carolina Forest HS (SC)
DJ Crook, QB (Penn State Transfer)
Josh Wynn, FS from CBA, Albany NY
Sean Kennedy, OL from St. Peter's HS
Mason Gray, DB from St. John's College HS
Dione Alston, RB from Salem HS (NJ)
Donte Terry, DB from Martin Luther King HS (PA)
Griffin Clancy, OL, from Saratoga Springs (NY)