Is Kung Fu Panda based on a true story?

Answer 1

No

First of all, all the animals in the movie are anthropomorphic, so that part is obviously not true.

Second, it is based on a mythical scroll that would grant the user magical Martial Arts powers - and magic doesn't exist in the real world, so that part cannot be true.

There is the generic trope of an orphan proving himself/herself which applies to countless true stories.

There is the generic trope of the outsider proving themself against the supposed "experts" - again, not unique to a single story.