Muttley, there were few songs about the Famine, and most of those that were written (like The Praties They Are Small) were written in America.

You might, from your own family experience, be interested in Na Connerys, a song in Irish about a family transported through the actions of an informer; the song, with beautiful poetry and a gentle, meditative tune, is a curse addressed to the informer.

Not to throw oil on troubled flames, but the Famine, like virtually all famines, was a concatenation of crop failure and human (in-)action. Racist eugenic ideas and laissez-faire economics conspired in the action of the British government, which took the view that the lazy and incompetent would be starved, to the better advantage of the strong and hardworking survivors.