Man pages matching name image::exiftool::tagnames in section 3pm:

Image::ExifTool::TagNames.3pm.en	debian 10 / libimage-exiftool-perl
Image::ExifTool::TagNames.3pm.en	debian 11 / libimage-exiftool-perl
Image::ExifTool::TagNames.3pm.en	debian 12 / libimage-exiftool-perl