What can I use instead of creme fresh or whipped cream cheese both of which I do not have on hand?

As the recipe calls for only 2 tablespoons of creme fraiche, you could sub (ideally regular, not low fat) plain yogurt or sour cream. Or just increase the mayo by 2 tablespoons. Given the type of recipe, it's not a make-or-break issue.
Fun reading on making your own creme fraiche:
http://food52.com/hotline/14318-how-do-you-make-creme-fraiche

I would try Greek yogurt or Labne if you have either one.