Is a singing technique in which the voice half-sings and half-speaks the melody?

Sprechstimme or Sprechgesang

Explanation:

Vowel-based singing, seeking a timbre unit throughout musical heights, is called Sprechstimme (spoken voice), idealized by Arnold Schöenberg, as a technique of vocal utterance that moves between singing and speech. It is also known as Sprechgesang.