I find that in winter, the original all-season tires do not provide enough traction. Can I put snow tires on just the front wheels?

No. If you live in an area or drive in conditions that require tires with better traction, you should consider installing winter tires, but you must install them on all 4 wheels, not just the drive wheels. Be sure to use tires that are the same size as originally specified for your Hyundai.