This word was confirmed as canon by Okrand/Maltz in HolQeD volume 9 issue 4.
qurgh
Date: Thu, 9 Mar 2023 00:59:11 +0000 (UTC)
From: James Landau <savegraduation@yahoo.com>
To: "tlhingan-hol@lists.kli.org" <tlhingan-hol@lists.kli.org>
Subject: Re: [tlhIngan Hol] Klingon Word of the Day: tangqa'
>Subject: Re: [tlhIngan Hol] Klingon Word of the Day: tangqa'>>SEE ALSO:>[mInHor] (?)? ??? minn'hor (n)
>? - "An ox-like carnivorous animal used for riding" (Kahless [J.M. Friedman's pro novel])
>? -? ?The *minn'hor* is a beast of burden (similar to cattle), the milk of which is used to make cheese.? (Felix, 7/25/2016)
I've never heard of this. I can't find the word at https://www.frathwiki.com/Klingon/lexicon nor at the wiki. It would be a good "fanon" word to confirm as canon with Marc Okrand at the next qep'a' or qepHom, though.