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Stuffed toys are exactly that, toys. They aren't representative of real lions and tigers in many ways, including most relevantly that they are cute, not ferocious, and are usually much smaller.

If you had a lifelike stuffed tiger and you posed it in contexts where it wasn't immediately obvious that it wasn't real, I bet you'd get some amazing startle reactions. It sure works with dinosaurs, even though dinosaurs haven't existed for millions of years: https://www.youtube.com/watch?v=DSup2gj2Gn4

Yeah but that's the same startle reaction you'd get from any large object traveling towards. I bet if you just moved a steel beam at those speeds out at someone and had it track their position like the "dino" seemed to then they'd be startled too.

It just suggests that we've evolved fears of some, but not all, things which are dangerous to us?

An analogy might be, many people are afraid of heights, and fewer people are afraid of water. That's despite the fact that water is also dangerous. But none of this proves or disproves the notion that fear of heights may be "hardcoded".

The look like soft little puppies. Everybody loves and nurtures puppies.

That's size dependent plenty of kids fear life sized stuffed lions. Though this may go away with exposure.