It's probably necessary to look up more specific info on one's local stuff to be sure that it's safe for babies and is actually made with peanuts, but peanut-based sauces and dressings are fairly widespread. Any place with major influence from south Asia or southeast Asia likely has some form of peanut chutney or satay sauce, for example.
I mean you can crush peanuts to powder and use however you want, just make sure to start with microscopic amounts and have strong anti-histamine at hand in case your kid is unlucky one like mine.