• WordNet 3.6
    • n squawker the loudspeaker on an intercom or public address system
    • n squawker a person given to excessive complaints and crying and whining
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Century Dictionary and Cyclopedia
    • n squawker One who or that which squawks. Specifically— A duck-call. Sportsman's Gazetteer.
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In literature:

Squawker seemed quite pleased, however, and turned himself round and round for their approval.
"The Wonderful Bed" by Gertrude Knevels
Everlasting wailings of penny squawkers!
"The Skipper and the Skipped" by Holman Day