Directly from their wki description, dragon_horns are just any horns on a dragon_girl or boy. This seems nearly equal to ~dragon_girl ~dragon_boy horns (or just dragon_girl horns) and redundant.
The same applies to a number of other mythical creature parts, such as dragon_wings, dragon_tail, demon_wings (all their wikis literally say "wings/tail of dragon/demon girls (or boys)") and demon_horns (no wiki, but probably use the same description). Is there a reason for them to exist?
Additionally, I feel like there's a similar problem with some ears, tails and horns tags, mostly spawned by kemono_friends -- they aren't described and recognized as anything other than "animal ears/tail/horns on an X-girl".
What do you think?