Man pages matching name mkfifo in section 3:

mkfifo.3.en	debian 10 / manpages-dev
mkfifo.3.es	debian 10 / manpages-es
mkfifo.3.ja	debian 10 / manpages-ja-dev
mkfifo.3.pt	debian 10 / manpages-pt-dev
mkfifo.3.en	debian 11 / manpages-dev
mkfifo.3.fr	debian 11 / manpages-fr-dev
mkfifo.3.ja	debian 11 / manpages-ja-dev
mkfifo.3.pt	debian 11 / manpages-pt-dev
mkfifo.3.en	debian 12 / manpages-dev
mkfifo.3.fr	debian 12 / manpages-fr-dev
mkfifo.3.ja	debian 12 / manpages-ja-dev
mkfifo.3.ru	debian 12 / manpages-ru-dev
mkfifo.3.en	debian 13 / manpages-dev
mkfifo.3.fr	debian 13 / manpages-fr-dev
mkfifo.3.ja	debian 13 / manpages-ja-dev
mkfifo.3.pl	debian 13 / manpages-pl-dev
mkfifo.3.ro	debian 13 / manpages-ro-dev
mkfifo.3.ru	debian 13 / manpages-ru-dev