Man pages matching name freopen in section 3:

freopen.3.de	debian 10 / manpages-de-dev
freopen.3.en	debian 10 / manpages-dev
freopen.3.es	debian 10 / manpages-es
freopen.3.ja	debian 10 / manpages-ja-dev
freopen.3.pl	debian 10 / manpages-pl-dev
freopen.3.zh_CN	debian 10 / manpages-zh
freopen.3.zh_TW	debian 10 / manpages-zh
freopen.3.de	debian 11 / manpages-de-dev
freopen.3.en	debian 11 / manpages-dev
freopen.3.es	debian 11 / manpages-es-dev
freopen.3.ja	debian 11 / manpages-ja-dev
freopen.3.pl	debian 11 / manpages-pl-dev
freopen.3.zh_CN	debian 11 / manpages-zh
freopen.3.zh_TW	debian 11 / manpages-zh
freopen.3.de	debian 12 / manpages-de-dev
freopen.3.en	debian 12 / manpages-dev
freopen.3.fr	debian 12 / manpages-fr-dev
freopen.3.ja	debian 12 / manpages-ja-dev
freopen.3.ru	debian 12 / manpages-ru-dev
freopen.3.zh_CN	debian 12 / manpages-zh
freopen.3.zh_TW	debian 12 / manpages-zh