laryngealize

verb2

1. •
   To articulate as a laryngeal sound, to produce (a sound) through or with action of the larynx.
2. •
   To modify (a pronunciation or a sound) by constricting the larynx.

   • But creaky or laryngealized quality throughout whole stretches of very low-pitched speech characterize boredom, reluctance [etc.] Children typically laryngealize their voice for coaxing adults. — 1993