title_body: Which sounds could a lipless humanoid produce?
upvoted_answer: At first sight, it seems that it is impossible for the lipless humanoids to produce any sounds that involve the lips in their production, this concerns the following groups of sounds:
  
  
  bilabial consonants: pʰ p p' b m w
  labiodental consonants: f v
  labialised consonants: qʷ χʷ
  rounded vowels: o u ɔ
  
  
  But: There is a known art, named ventriloquism, where replacement sounds for those sounds that require visible lip movement are used to produce understandable speech. Maybe the lipless humanoids can cope with this and even learn to produce the Gé̃kt's sounds using such techniques.