(X means that it is subject to change)
I like to imagine that they got transported into the MLP world somehow at around the start of camp and they've just had to find their place in it.
They set up their camp in the Everfree forest (as it's the closest to the camp because of the natural weather patterns and actual wild animals) and just stayed there.
They figured out the naming system and only started to give themselves names when they started to get cutie marks (the adults already had them, so they immediately chose names. They either chose their own names, someone from camp made a name for them and it stuck, or someone like Pinkie Pie met some of them, looked at their cutie marks, and then started guessing names to which they just said "Yup! That's it, that's my name..." idk
Maybe they find a way to get back like in Equestria girls and some of them stay in Equestria most of the time because of how peaceful and nice it is *cough cough* Max and David *cough cough* and just make a life there.
maybe Campbell would stay too. Maybe try and start a new scheme cause the government wouldn't know where he is...
Idk just some pony-obsessed rambles
Edit: JUST WANTED TO INCLUDE that the 3 main woodscouts (we don't count jermy he's a joke character and I don't care about him) and the 3 main flowerscouts are all included in this. They have to stay with the camp Campbell campers and learn to GET ALONG. (and that gives me a good reason to add pikemax HAHAHAHA)