Yes, they do! Just like women's rings, you can find rings in different sizes for young girls, too. To learn your daughter's measurement, you can measure a ring they already own, use a ring sizer, or go and see a jeweller who can measure the size for you.
If you're unsure of your child's ring size, you might also want to choose an adjustable ring. Adjustable rings are common in girls' rings because young children grow quickly. By choosing an adjustable style, the ring can grow with the child, and they can enjoy it for a long while before they grow out of it.