Jack Jone (formally known as John Allen Jones) is the voice of Greg's frog and sings the intro theme to Over the Garden Wall and some other songs throughout the series. He is known for being a Jazz and Pop singer. Official website IMDb
Over the Garden Wall (song), Jaden's Adventures Wiki
Chris Jericho - Wikipedia
Jason Funderburker (the frog), Over the Garden Wall Wiki
Christopher Lloyd - Wikipedia
Over the Garden Wall Wiki
Over the Garden Wall Wiki
Over the Garden Wall, The Dubbing Database
Syd Barrett - Wikipedia
Jack O'Halloran - Wikipedia