Does FreeBSD have the equivalent of “-slim” in Ubuntu/Debian speak.

I see that NanoBSD exist but ~~(a) it looks abandoned and~~ (b) its target use case is routers, not general servers, because it creates an immutable base.

https://docs.freebsd.org/en/articles/nanobsd/

EDIT: I stand corrected. It is maintained. Thanks for info.

OccamBSD is a new script cutting down FreeBSD to a minimum, the README has some links to other alternatives: https://github.com/michaeldexter/occambsd