KRWG Online The Science Digest - how Kermit got his skin tone KRWG | By Vince Gutschick Published November 17, 2020 at 8:45 AM MST Facebook Twitter LinkedIn Email Listen • 1:29 www.usgs.gov - green tree frog Why are frogs green? And how can they survive that way??? Here’s Vince Gutschick with the Science Digest.