Man pages matching name cjpeg in section 1:

cjpeg.1.en	debian 10 / libjpeg-turbo-progs
cjpeg.1.pl	debian 10 / manpages-pl
cjpeg.1.en	debian 11 / libjpeg-turbo-progs
cjpeg.1.en	debian 12 / libjpeg-turbo-progs