The story
Because it peeps (makes a sound) in the spring (the season).
First known use, by meaning
- from 19th c. A small chorus frog of North America (Pseudacris crucifer).
Etymology from Wiktionary, CC BY-SA 4.0.
spring peeper
Today it means: A small chorus frog of North America (Pseudacris crucifer). Full definition →
First used 19th c.