From the syndicated Festival of Family Classics:
Jack O'Lantern springs from Irish folklore, and in this adaptation, is a leprechaun trapped in the shape of a pumpkin. Two kids, not knowing, carved the traditional face on the pumpkin, and after a formal meeting, if you will, in the barn, get Jack to agree to be the head of their scarecrow......
All that is available in English at the moment is this trailer, which apparently also included an adaptation of Yankee Doodle (not shown).
I remember seeing this, but it didn't move me all that much.