Nouns

(n)mutter, muttering, murmur, murmuring, murmuration, mussitationa low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
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(n)grumble, grumbling, murmur, murmuring, mutter, mutteringa complaint uttered in a low and indistinct tone
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Verbs

(v)mumble, mutter, maunder, mussitatetalk indistinctly; usually in a low voice
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(v)murmur, mutter, grumble, croak, gnarlmake complaining remarks or noises under one's breath“she grumbles when she feels overworked”
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