Man pages matching name pg_tapgen in section 1p:

pg_tapgen.1p.en	debian 10 / libtap-parser-sourcehandler-pgtap-perl
pg_tapgen.1p.en	debian 11 / libtap-parser-sourcehandler-pgtap-perl
pg_tapgen.1p.en	debian 12 / libtap-parser-sourcehandler-pgtap-perl