Name of Happy Feet Character That Can't Sing

This page is the CodyCross answer for the clue below from California, Group 1144, Puzzle 5 (Sunset Boulevard).

Question is: Name of Happy Feet Character That Can't Sing

and the answer is: MUMBLE

Word Meaning:

MUMBLE — (transitive, intransitive) To speak unintelligibly or inaudibly; to fail to articulate.

Definitions from Wiktionary.