Man pages matching name data::serializer::freezethaw in section 3pm:

Data::Serializer::FreezeThaw.3pm.en	debian 10 / libdata-serializer-perl
Data::Serializer::FreezeThaw.3pm.en	debian 11 / libdata-serializer-perl
Data::Serializer::FreezeThaw.3pm.en	debian 12 / libdata-serializer-perl