Stoll was crowned the Mannelly Award winner during his sixth season.
Tinsley will join fellow Nittany Lion Jahan Dotson, who was drafted in the first round last year.
Hippenhammer appeared in 20 games with the Nittany Lions before transferring to Miami (Ohio).
The Nittany Lions split the doubleheader thanks to two big home runs in game two.
Sutherland joins the Seahawks after six years at Penn State.
With the two wins over the Fighting Illini, the Nittany Lions move to eighth place in the conference.