Carey, 31, made his NHL season debut against Washington on November 16 and leads Providence in scoring this season with seven goals and six assists for 13 points with a plus-eight rating in 17 games.
Frederic, 21, has appeared in two games with Boston and has tallied five assists in 15 games with Providence this season.
Vaakanainen, 20,has skated in three games with Boston andhas also tallied two assists in 15 games with Providence this season.