Where did we learn this canon fact?
Besides the dual stream confirmation in Discovery, I believe it’s in Enterprise that we first learn that Klingons have two of every organ.
And I believe I recall a throw away line of confirmation (of the double organs) in Picard.
I’m honestly surprised if Lower Decks hasn’t dealt with the topic yet.
Klingons have two of every organ.
The Skin is an organ, not just an organ but the largest organ.
That explains the facial folds.
Not canon, but there was a fan theory that the changes occurred after the tribbles were transported aboard the Klingon ship in TOS.
They retconned the TOS Klingons in Enterprise
https://en.m.wikipedia.org/wiki/Affliction_(Star_Trek:_Enterprise)
TIL
Thanks
And also why mother Klingons carry their young by gripping the loose skin on the back of their necks… no wait, I’m confusing Klingons with something else, aren’t I?
plays Toccata in Vitamin D
“Klingons are like onions.”
“You mean they smell bad?”
*cannon
It’s in the title of the post. Canon would be if something would be verified in the Star Trek universe. Which this is, sure, but think about it: it’s much more likely to be a comment on the girth and power of Klingon instruments