Man pages matching name ebook::tools::mobipocket in section 3pm:

EBook::Tools::Mobipocket.3pm.en	debian 10 / libebook-tools-perl
EBook::Tools::Mobipocket.3pm.en	debian 11 / libebook-tools-perl
EBook::Tools::Mobipocket.3pm.en	debian 12 / libebook-tools-perl