A parody on The Mistletoe Bough is The Workhouse Boy where instead of hiding in a trunk, he falls into a very large kettle of soup and isn't found until years later when the other orphans have finished the soup. As for Christmas Day in the Workhouse, the version I remember from school in London is:
T'was Christmas day in the workhouse, the snow was falling fast,
We don't want your christmas pudding, stick it etc. etc.