Preload with 'knoledge'
Presumably you could buy one, and then before giving it to the kid preload it with all the things you think they might 'enjoy' talking about, by seeding the 'Barby learns all about you'. E.g. Buy Doll, ask doll lots of questions about maths, raspberry pi, the register, car mechanics, thai cooking, the joys of reading a book, playing outside, making dens, climbing trees, growing up to be an engineer etc and then hand the doll to the child, happy that Barbi will suggest something 'suitable' when they ask it an inane question. Having said that, my 4 year old recently asked me "What if the earth had legs?". I had no answer to that and so reflected it back to the child: "I don't know, what if the earth had legs?". He said "It would walk on the sun.". Fair enough.