This has been a Girl Scout song for decades and I suspect is in one of the Girl Scout books, which I do not have at hand. Susan of DT knows lots of GS songs also. I learned it in Oklahoma in the 50s in a very similar form. As I recall, we sang "singing as dawn shines above" and "I would never fly away" and the refrain sounded rather like "tucker a kwah, kwah, kwah" but virtually the same.