Could be the original minstrel song you're after which is called 'Keemo Kimo'. I'd say it's a pretty good bet this is the source of the Froggy went a courting variants that use those refrains and chorus as well as other songs like the above-posted variant of 'The Carrion Crow'. I'd be surprised if 'Keemo Kimo' isn't in the DT somewhere. I can post it if it isn't.