yes
It was a movie first.
Crispin Glover as an older George McFly.
yes it is technically
There are novelizations. These are different to the films, however.
back to the future
Gray's Sports Almanac
I do not know of a movie of that name but I do have the book written by T.H.White wonderful story.
yes the movie was released latter. The book was published 1960 and the movie in1962.
Yes, it was a book before it was adapted into a movie.
I've seen the movie already and read the book. you can see it without reading the book, but some scenes wont make sense, like how it flashes to Peeta throwing Katniss bread, but doesn't give the back story. I suggest you read the book before seeing the movie.
Some believe that the book is better and some believe the movie is better. I have not read the book before but remember what's in the book isn't always in the movie.
There is no information yet if Ingo will be converted into a movie. However, there is a likelihood that the book will be used as a film script in the near future.