Mutter
Part of speech: noun
Definition: A repressed or obscure utterance; an instance of muttering. (in Indian restaurants) peas
Part of speech: verb
Definition: To utter words, especially complaints or angry expressions, indistinctly or with a low voice and lips partly closed; to say under one's breath. To speak softly and incoherently, or with imperfect articulations. To make a sound with a low, rumbling noise.
Croak
Part of speech: noun
Definition: A faint, harsh sound made in the throat.The cry of a frog or toad.
Part of speech: verb
Definition: To make a croak.Of a frog, to make its cry.To die.Of a raven, to make its cry.To kill someone or something.