bibbling

Example:He could be heard grumbling softly to himself as he cooked.

Definition:To speak or make sounds of an annoyed or disgruntled nature; murmur.

Example:The child was pouting loudly as his parents debated whether to give him a treat.

Definition:To furrow the brow and lower the mouth in a reproachful or stubbornly discontented manner.

Example:She rated her terrible service with such exaggerated whines that it was comical.

Definition:To express disappointment or discontent in a high-pitched, whiny voice, typically in a way that is ridiculous or absurd.