Eastern Gray Treefrog (Dryophytes versicolor). 

The frog that sounds like a woodpecker. 

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The following Cornell Lab | Macaulay Library recordings were used in this episode: 

• Red-bellied woodpecker call by Geoffrey A. Keller (ML507296)

The following USGS recordings were used in this episode: 

• Eastern gray treefrog call by U.S. Geological Survey
• Cope's gray treefrog call by U.S. Geological Survey

Sources and more: 

• https://dnr.illinois.gov/education/wildaboutpages/wildaboutfrogs/waftgraytreefrog.html
• https://www.umesc.usgs.gov/terrestrial/amphibians/armi/species/eastern_gray_treefrog.html
• https://www.umesc.usgs.gov/terrestrial/amphibians/armi/species/copes_gray_treefrog.html
• https://dnr.illinois.gov/education/edu-pages-main/a-f/edufrogtoad.html
• https://multimedia.illinois.gov/dnr/HDIGreyTree.mp4
• Wisconsin Citizen-Based Monitoring Network (https://www.youtube.com/watch?v=iLBehkuQgtk)