Yes. Toy Story has been adapted into books. These include story collections, character-focused tales, and sometimes even activity books. It depends on what kind of book you're looking for specifically.
Toy Story isn't based on a book. It's an original concept developed specifically for the big screen by the talented team at Pixar Animation Studios. The story and characters were crafted for the medium of animation rather than being adapted from a pre-existing literary source.
The author of the Toy Story book is actually none other than Laura Numeroff. Her creative touch brought the story to life with vivid characters and an engaging plot.
The authorship of the Toy Story book can be a bit complex. Different books within the Toy Story universe might have different writers. Maybe you could provide more details to narrow it down.