I wouldn't use Worf as an example. His makeup changed many times over the course of TNG, DS9 and the movies.
This doesn't even count the movies. So Worf's appearance is different, as is his appearance compared to the Klingons from the Trek movies.
In any case, none of them look like Kryten, so you are mistaken. The Klingons in STXII have clearly defined ridges. It was very easy to see in the movie.