Bald klingons are actually pretty common

**We see this charming fellow in the reboot film Star Trek (2009)**  
![enter image description here][1]

General Chang from the Film "Undiscovered Country"

![enter image description here][2]

And this bald(ing)chap in a background shot in The Original Series

![enter image description here][3]


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Moving down the canon scale, we also come across hairless Klingon warriors in various trek novels

> *“What’s this offal?” the bald Klingon groused, sweeping the
> accumulated padds and isolinear rods onto the floor. He stalked away
> from the workstation, trampling the fruits of Picard’s labors under
> his feet. “I should have known we wouldn’t find anything worth taking
> on this miserable ship.”* - **TNG: Glass Empires**

and

> *A bald Klingon appeared, bowing before the Regent. The port officer was scrawny, with dark overhanging brows and a long, thin mustache
> drooping from the corners of his mouth. "Greetings, Regent Worf, on
> behalf of Khitomer You are cleared to maintain your current orbital
> altitude. You may beam down to the spaceport at your convenience."*
> **DS9 : Dark Passions**



  [1]: https://i.sstatic.net/hUzy7.jpg
  [2]: https://i.sstatic.net/ituOn.jpg
  [3]: https://i.sstatic.net/Xkl2K.jpg