What is the French phrase for melon and parma ham?

There's no single, specific French phrase for "melon and parma ham". You'd likely describe it as:

* Melon et jambon de Parme (the most literal translation)

* Salade de melon et jambon de Parme (melon and parma ham salad)

* Melon au jambon de Parme (melon with parma ham)

The most common way to order it in a restaurant would be to simply say "Un melon et jambon de Parme, s'il vous plaît" (A melon and parma ham, please).