To dream of french fries represents thoughts that are frivolous, unimportant, or not serious. Enjoying yourself wasting time being involved in an activity that you know isn't that long-lasting or of real value.
Example: A woman dreamed of eating french fries. In waking life she was enjoying herself taking an educational course to pass time. She started to feel that the course wasn't worth the effort after realizing that it wouldn't produce a real certificate to help her get a better job. She felt that she was wasting time even though she enjoyed the educational course.
*Please See Potatoe Wedges