I had another crack at that Library of Congress field recording, and this is what I came up with:

Oh, see that watermelon smiling through the fence
Oh, how I wish that watermelon it was mine
Oh, white folks must be foolish, ...(?) a heap o' sense
Or they wouldn't leave it smiling on the vine.

CHO: Oh the ham is sweet and the bacon good
And the possums am very, very fine.
Oh, give me, give me, oh, how I wish you would
At the watermelon smiling on the vine.

Oh, when the day drew dark and fallen then that melon's gwine to go
Oh, I knowed it would be most awful good or else I is a fool. CHO.