The main antagonist of Toy Story 5, in theaters this summer, is a green, frog-shaped kids’ tablet named Lilypad, a genius new villain for the beloved Pixar franchise. But if Pixar had its ear to the ground, it might have used an AI kids’ toy instead. AI toys are seemingly everywhere, marketed online as friendly companions to children as young as three, and they're still a largely unregulated category. It’s easier than ever to spin up an AI compa…