Frederic, 21, made his NHL debut on January 29 and has skated in 13 games with Boston this season.
He has also skated in 51 games with Providence this season, tallying 11 goals and 11 assists for 22 points with 67 penalty minutes and a plus-four rating. The 6-foot-2, 200-pound forward also notched five goals and three assists for eight points in 13 games with Providence following his collegiate season at University of Wisconsin in 2017-18. Frederic spent two seasons at Wisconsin from 2016-18, compiling 32 goals and 33 assists for 65 points in 66 games.
The St. Louis, Missouri native was originally selected by Boston in the first round (29thoverall) of the 2016 NHL Entry Draft.
Senyshyn, 22, is in his second professional season with Providence and has tallied 14 goals and 10 assists for 24 points in 62 games. In his first season with the club in 2017-18, the 6-foot-3, 196-pound forward posted 12 goals and 14 assists for 26 points in 66 games.
Prior to turning pro, Senyshyn spent three full seasons with the Soo Greyhounds of the Ontario Hockey League (OHL) from 2014-17. He compiled 114 goals and 63 assists for 177 points in 195 career OHL appearances.
The Ottawa, Ontario native was originally selected by Boston in the first round (15th overall) of the 2015 NHL Entry Draft.
