Can I use a jump starter to start my gas scooter?

You need to learn the words so you can talk to people about what you are doing. There is no such thing as a "jump starter". A jumper is a very old term for any wire used to make a temporary connection. In modern times it refers to cables used to connect two car batteries together. If your little whizbanger has a 12 volt battery and electric starter, then yes, you can use jumper cables to get it started. Check for a plus sign and a minus sign on the battery and only connect plus to plus and minus to minus. If you get a shower of sparks, you made a wrong connection.