Crush vanilla wafers into fine crumbs (save 1/2 C. crumbs to roll finished pecan roll in). Mix milk, crumbs and pecans together. Shape into rolls (any size and length you want) and roll in saved crumbs. Wrap in non-stick foil and put in freezer to set. Leave in freezer at least 1 hour before slicing. It can be eaten frozen or left out a few minutes for a softer consistency.