Steven Boozer wrote:

>FWIW we now have the noun {Su'nIm} ?raised profile, ridges, pattern (as in fingerprints, tires, shoe >tread)? from qepHom 2015.  Okrand affirmed at qepHom 2009 that a single forehead ridge is a >{vIlHom}.
>
>To describe foreheads {QuchDu?} we use {vIl} ?be ridgy? vs. {Hab} ?be smooth?.  Before {vIl} some >of us used {ghegh} ?be rough? or {tlher} ?be lumpy? (associated with food in KGT) to describe >foreheads, so I suppose these are available.
>
>If I saw *{qab vIl / ghegh / tlher} though, I would immediate think of those latex prosthetics that Trek >actors wear on their faces when playing aliens.  <g>

"Su'nIm" could be a good word for wrinkle. I'm surprised, though, that it took until 2009 for Klingon to have a word for something as quintessentially defining of Klingons as forehead ridges. There is the SF narratology term "rubber-forehead alien" for instance.