This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. One who vocalizes.

n. an organism that can utter vocal sounds

n. a person who sings

"Spittle continued to dribble from its vocalizer gill, while its arms flopped round like landed fish inside their cybernetic casings."

being    organism   

vocalize