What literary device is used in the warning that "they'd advertise" if they found out about a pair of Nobodies

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Explanation:

The poem opens with an oxymoron - the speaker calls self Nobody.  Note the capital N that would refer to it being a proper noun.  Same as if you were to list your name... It also uses figurative imagery.  Read about how "Somebody" is like a frog. Frogs are loud and they croak loud.   This is a lyric. It is about her own reclusive personality.  Rhythm uses dashes and a simile to describe herself.  

Note:  She uses simile, hyperbole - exaggeration, allusion, and the idiosyncratic punctuation that includes the dashes.  

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