F&G stands for "folded and gathered." In other words, all the pages of a printed book have been gathered up and folded together – but not bound into hard cover yet. Sometimes, if you're lucky, the F&G's come with candy.
We Love You, Rosie was written by Cynthia Rylant and will be released in spring of 2017. I just finished reading Cynthia's High-Rise Private Eyes series (Bunny Brown and Jack Jones) and laughed myself silly.