Man pages matching name function::fallback::coreorpp in section 3pm:

Function::Fallback::CoreOrPP.3pm.en	debian 10 / libfunction-fallback-coreorpp-perl
Function::Fallback::CoreOrPP.3pm.en	debian 11 / libfunction-fallback-coreorpp-perl
Function::Fallback::CoreOrPP.3pm.en	debian 12 / libfunction-fallback-coreorpp-perl