It summons a Small Supsprite Token. However, if you already control a Small or Medium Supsprite Token, remove all cores from one, place them into your reserve, and summon the next size Supsprite Token instead.
Supsprite Tokens increase size in the order Small -> Medium -> Large.

No, you cannot. If you can increase the size of an existing Supsprite Token, summon an increased size token rather than a new Small Supsprite Token.

Yes, you can.