Nick:
You're just going to have to bite the bullet and do it! Get something that can fit in along side the rock - a stick, a skewer, whatever - and pry the rock out. First squirt some oil up in there to make it all slippery, and pry the rock out. This is all part of being an animal-keeper (or a dad). You're going to have to solve all kinds of problems in day-to-day tortoise-keeping. Yes, it's going to hurt the tortoise, but it will be over quickly. Then clean it well and apply some Neosporin.
What do you think the vet will do? Same as described above.
You're just going to have to bite the bullet and do it! Get something that can fit in along side the rock - a stick, a skewer, whatever - and pry the rock out. First squirt some oil up in there to make it all slippery, and pry the rock out. This is all part of being an animal-keeper (or a dad). You're going to have to solve all kinds of problems in day-to-day tortoise-keeping. Yes, it's going to hurt the tortoise, but it will be over quickly. Then clean it well and apply some Neosporin.
What do you think the vet will do? Same as described above.