Smallville has elements of the Superman mythos, but it's more of a unique take on the character's early years. It's not the sole authentic version of his story. Other comics and adaptations offer different perspectives.
I'm not sure. I haven't read the 'Kansas Star' novel. It could potentially have a tiger story. Some novels use animals as important plot devices or to add an element of mystery or danger. If the novel is set in a location where tigers could be relevant, either literally or symbolically, then there may well be a tiger story in it.
Yes, there are some real - life inspirations. 'Brightburn' is a horror - take on the Superman origin story. Kansas is often associated with Superman's fictional origin. While not based on one specific true story, it plays on the idea of a child with extraordinary powers in a small - town Kansas setting, perhaps inspired by the rural, Americana feel of Kansas and the concept of a 'normal' place being disrupted by the arrival of someone with superhuman abilities.