Like the other reply said, it is called a Balance Bike.

To add some more context, it is not a scooter because you aren’t supposed to stand up on them but sit like a real bike but you move by pushing with your feet. They are training bikes for toddlers before they have the hand-eye coordination for peddling and you can either graduate to a kids bicycle with training wheels or some kids just go straight to the bicycle without the training wheels.