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It's cannon.
(startrek.website)
Star Trek memes and shitposts
Come on'n get your jamaharon on! There are no real rules—just don't break the weather control network.
That explains the facial folds.
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?
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