Man, so many Ghostbusters to call. In theaters this week, “Ghostbusters: Frozen Empire” is the follow-up to the largely enjoyable 2021 adventure “Ghostbusters: Afterlife.” The latter, which saw Jason Reitman — son of Ivan Reitman, director of 1984’s original “Ghostbusters” and its 1989 sequel, “Ghostbusters II” — at the helm, introduced a new generation of brave spirit-catching souls while also bringing back key legacy characters. Well, the “Ghostbusters” franchise obviously isn’t ready to let go of the past. “Frozen Empire” — co-written, like its predecessor, by Jason Reitman and Gil Kenan, who takes over directing duties this time — is similarly packed with multiple generations of Ghostbusters.