Fisher spent 13 years coaching for Penn State men's hockey.
"Penn State enters this new era of college sports in a position of strength and ready to attack this new collegiate landscape."
Polydor is the third cornerback commit for Penn State in the 2026 recruiting class.
Rehfuss reunites with head coach Kayla Treanor after serving as her offensive coordinator at Syracuse in 2024.
The defensive end picked up the injury working out at home over summer break.
Ott will be the only head coach in the NBA with ties to Penn State.