Man pages matching name authen::simple::ftp in section 3pm:

Authen::Simple::FTP.3pm.en	debian 10 / libauthen-simple-net-perl
Authen::Simple::FTP.3pm.en	debian 11 / libauthen-simple-net-perl
Authen::Simple::FTP.3pm.en	debian 12 / libauthen-simple-net-perl