Foolstroupe, at the Bodleian are copies of "The Babes in the Woods" (from the type font probably early 19th c.) and a "New Version" (c. 1855), Harding B11(123) which is moralistic and preachy.
I am going over the older one, which is much as you describe it, and will post it tomorrow, after I make sure that I have got it correctly. It is worth a look, as it has a primitive cut showing the two dead babes, a man on the scaffold, and in the foreground the two Ruffians (both wearing spurs).
The verse about the Robin-redbreast covering them with leaves (sob!) is there, and it goes on to tell of the heavy Wrath of God falling on the Uncle, and ends with a caution to Executors and Overseers that they could meet the same fate.