Fish

Someone who blabs his or her mouth constantly but doesn't really say anything (useful) much like how a fish is always opening and closing its mouth but never really says anything.

That guy over there is such a fish.

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Lorax

Based off the the Dr. Suess character that 'speaks for the trees.'

A lorax is also a term that can be used to describe an ambassador or pretty much anyone who decides they're going to speak on the behalf of others as if they know what everyone is thinking.

"What do you mean 'we?' You're not our Lorax!"

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