Maine Coon cat, quite likely.
Yeah, they have to be told what is "food" at first. I forgot about that. Been nineteen years since I last had a kitten, but I do recall that she had to be shown that the food was something to eat. I shoved her muzzle into the Kitten Chow-and-milk. Later, she understood dry Kitten Chow. But when I switched her to normal Cat Chow, she needed it explained again. Later, she apparently realized that the shape doesn't matter, but not at first.
See, kittens
have no brains. Really! OTOH, they have no experience, either.
BTW, that cat is the one I learned not to feed Purina (critter) Chow with. She eventually came down with a case of FUS, which is NASTY! Got educated about the topic, and switched her food to better stuff. Never happened again.
Link 1
Link 2
Hm, looks like newer research into the problem has made it a bit less simple.