There are broadside copies in the Madden Collection at Cambridge and (on-line)at the Bodelian Ballad site: search the latter for "Little Pigs."

None of the broadside versions indicates sound effects, unfortunately.

Vol. 8 of the Greig-Duncan Collection, p. 196, offers a Scottish version collected nearly a century ago, beginning, "Little Pigs Sit with their Backs All Bare."

The earliest allusion to the song I know of occurs in Tobias Smollett's "Peregrine Pickle," ch. 56 (1751), concerning "that celebrated English ditty, the burthen of which begins with, The pigs they lie with their arses bare."