Do disney and pixar collaborate on toy lines?

Quick Answer
There is no verified evidence that Disney and Pixar collaborate directly on toy lines; toy licensing for Pixar films is typically handled by Disney’s consumer products division.
Explanation
Disney and Pixar routinely collaborate on film production, with Pixar providing animation and storytelling while Disney distributes and markets the movies. The only confirmed collaboration in the provided evidence is that Toy Story 4 was produced by Pixar Animation Studios for Walt Disney Pictures. Toy lines, however, are usually managed by Disney Consumer Products, which handles licensing agreements for merchandise. No source in the evidence indicates that Pixar itself participates in toy design, production, or marketing. Therefore, while Disney and Pixar work together on cinematic projects, their partnership does not extend to toy lines according to the available information.