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spring peeper

noun
  1. a tree frog, Hyla crucifer, having an X-shaped mark on the back and voicing a shrill call commonly heard near ponds and swamps of eastern North America in the early spring.
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Origin of spring peeper

An Americanism dating back to 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018