Answer:
The term scatting refers to a singer who sings neutral or non-sense syllables.
Explanation:
Scatting is a form of singing in vocal jazz whereby a singer improvises, invents, or makes up neutral, wordless, or nonsense vocables or syllables by guessing, or using their instinct or imagination, rather than by a careful plan. In scatting, the singer uses their voice as an instrument to create rhythms and melodies, rather than clear and comprehensible words.