Tortoises should not be handled by children, and only periodically by adults. Take a look at these digital photos, they should answer your question. If not, look at the plastron of the animal. If it has a 'hinge' between the first third and the remainder, which allows it to close up against the carapace, then it is probably a box turtle. If it does not have this hinge, it is probably a tortoise.
Females have a flat plastron.
I just noticed that my tortoise is blowing bubbles from his nose. The only time bubbles may occur that are okay, is if the animal just got a drink and has water in and around its nostrils, which may form bubbles upon exhaling. Otherwise, contact a veterinarian. If the animal is okay, return it to its burrow. I have had two tortoises since they were hatchlings.