Klingon alphabet (tlhIngan pIqaD) The Astra Image Corporation designed letters to represent Klingon writing forStar Trek: The Motion Pictureand based them on symbols created by Matt Jefferies which appear on the Klingon battlecruiser in the film, and also on the Tibetan script. Random Klingon lette...
but per Wikipedia the Unicode Committee rejected the Klingon proposal because "research showed almost no use of the script for communication, and the vast majority of the people who did use Klingon employed the Latin alphabet by preference ! (It is true, unfortunat...
So it isn't surprising that Klingon would be missing some of the sounds and equivalent letters of the English alphabet. It's likely that "native" Klingons would have difficulty speaking some of these sounds, similar to the way that foreigners sometimes have a hard time pronouncing or distingu...