I haven't really found anywhere saying tig is a vax either. Here is the insert for one tig brand:
It does not refer to it anywhere as a vax, although it does call it a "passive immunization" as opposed to an "active immunization" - a vax.
I guess there are other immune globulin treatments as well - like for Rabies? what else? just outta curiousity?
I also checked the FDA list of approved vaccines in the US and tig is not listed there.
Varicella and measles, off the top of my head.