"Frog Went A-Courtin'" is an English language folk song. Its first known appearance is in Wedderburn's Complaynt of Scotland (1548) under the name "The frog came to the myl dur", though this is in Scots rather than English. There are many texts of the ballad however the oldest known musical version is in Thomas Ravenscroft's Melismata in 1611. It has been recorded by Harry Belafonte, Pete Seeger, Burl Ives, Odetta, Salli Terri, The Brothers Four, The Smothers Brothers and The Young Tradition among others. I learned it from the Burl Ives Songbook.