Man pages matching name mallopt in section 3:

mallopt.3.en	debian 10 / manpages-dev
mallopt.3.en	debian 11 / manpages-dev
mallopt.3.fr	debian 11 / manpages-fr-dev
mallopt.3.en	debian 12 / manpages-dev
mallopt.3.fr	debian 12 / manpages-fr-dev
mallopt.3.ru	debian 12 / manpages-ru-dev