Quoted from winteriscoming:So can you take your Switch to the grocery store and scan these? No way I'm eating that cereal!
I honestly don't get the whole amiibo thing. I see those games with physical toys you scan to get a character in your game (Skylanders and Lego Portals?) and that makes sense, but what does an amiibo do other than let you get small bonuses in a game for paying for a toy? If they made a Pokémon game where you could buy a toy to get that Pokémon in your game, that would make sense, but I have yet to see anything nearly that compelling with amiibo. I haven't been following the functionality closely, though.
I know Yoshi Wooly World on Wii U had some that would let you get new skins for Yoshi, but those were so plentiful in the stock game that I had no reason to buy a toy to get a new skin. It's not like Yoshi would have any different functionality.
They really haven't done much with amiibo lately besides unlocks, but they have the ability to write to the toy, which is cool. In Smash Bros., you can play against an amiibo which "trains it" - it levels up and becomes a better player. It's like a training partner. You can write its stats back to the toy, and then take it to a friend's house so they can try fighting your amiibo.
The write ability works in a neat way with Wolf Link in BOTW. If you used Wolf Link amiibo with Twilight Princess, it saves your game info to the toy - and however many hearts you had in TP, when you use Wolf Link in BOTW, it'll have the same amount of hearts.