Thank you, GUEST at 06 Oct 15 - 06:27 PM!

That video leads us to the inescapable conclusion that the Frosty Morn piglets starred in at least two advertisements! I may have seen that ad as a kid, but it's the one with the lyrics scroll that I (and several others who've posted to this thread over the last thirteen years) seem to remember more clearly.

Kudos for the find anyway.