What is the title of green book Diary a wimpy kid?

There is no "Green Book" Diary of a Wimpy Kid book. The series is called "Diary of a Wimpy Kid" and features a variety of titles, such as:

* Diary of a Wimpy Kid

* Rodrick Rules

* The Last Straw

* Dog Days

* The Ugly Truth

* Cabin Fever

* The Third Wheel

* Double Down

* The Long Haul

* Old School

* Wrecking Ball

* The Meltdown

* The Getaway

* The Big Shot

* Diper Överlöde

* and more!

Perhaps you're thinking of a different book or series? Could you provide more details?