Also, flat guess on my part: a site mentioned the fruits dropping from trees and people gathering them because the mango walk (mango orchard) was public, so the fruits were there for the picking. Further, I think the Matty rag was just that: a rag that one would wrap around one's head to prevent getting conked on the noggin by one of the mangoes.

The song's association with the various forms/musics of Jamaica--and in this case some other Caribbean countries--will make finding the 'zygote' song really difficult.