Herrington becomes Penn State's first addition out of the transfer portal this offseason.
Fink appeared in just 10 games with the Milwaukee Admirals before getting called up to the NHL.
Penn State dropped after two straight upset losses.
Penn State went .500 last week in conference play.
Another talented Nittany Lion is entering the transfer portal.
Scade becomes the fifth Nittany Lion to ink a professional deal following the team's NCAA Tournament exit.