It is known and documented under "Jaws/Jaw harp" as well. I had never heard it called that and when you posted I was thinking "misspell" but knew your attention to detail so I did a search for it as "Jaws Harp" and..BINGO there it was. It makes perfect sense seeing as you play it with your "jaw/s".
Another fine example, at least for me, that one can learn something new every day. Thanks Cactus.
jrw159