Snakes hatch from eggs. Most snakes are oviparous, which means they lay eggs, and after a certain amount of time, the baby snakes hatch out of those eggs. Some snakes, however, are ovoviviparous or viviparous, meaning the eggs hatch inside the mother's body, or the babies develop inside the mother and are born live. But generally, when we think about snakes hatching, they come out of eggs.
As for your sentence, 'what do snakes hatch from?' - grammatically it is correct, but it is usually better to start a question with a capital letter, so: 'What do snakes hatch from?'