Seconding chopsticks, they’re a little tricky to use but you get used to them with practice. It’s nice to not have gross hands after snacking.
Or you can also go the whole I’m a gross monster route and just shake the bag into your mouth, I’m certainly guilty of that.
https://youtu.be/jEBELMDT6cE?t=262
You can’t really keep them from getting back up, they won’t stay on their sides perfectly balanced because of the curves on their legs. Even so they could “kick” their legs to push them to be able to get back up.
Just in case you’re wondering in the future if that will work.