What is it called when you change the nouns in an idiom. As an example if I were an artic explorer I might say "Tent Sweet Tent," after comming in from a long day in the cold. The idiom is "Home Sweet Home" but has been changed. Is there a word that would be used to explain that a standard idiom has been changed to mean the same thing but in a different instance. Are there just too few idioms that can be modified in this way to merit a discriptive general reference.