Puffy stickers

These were a hit recently at my 2yo’s bday party. Chubby little fingers can peel them from the backing, and the kids enjoyed adorning themselves with stickers. You could also try the Melissa and Doug puffy sticker set which comes with a pamphlet to which you can peel and restick the stickers indefinitely, but FYI some of those stickers are tiny and apparently irresistible to my 2yo, who slips them in her mouth, so you might want to remove those first.