Let it be recorded in the annals of literary history. On March 16th, 2006 CE, the very first Jenny was published outside of my blog.

The New Verse News, who accepted Honoring Dick Cheney Tanka last month, accepted How Now Chef Cow.

I guess it is theoretically possible somebody somewhere could have written a poem in this syllabic pattern previously, either intentionally or unintentionally.  If intentionally, I am not the creator of the form.  But we shall assume our culpability until we see proof otherwise.