Is there a MtG token made by WotC for the 1/1 Elf Druid token this card produces? I can't find one. And if not, what do you use that is tournament legal to represent these tokens? Can I just use an actual Llanowar Elf that's sleeved differently?
You can represent a token with whatever you want, as long as it is clearly and accurately represented.
No idea on the token. But to my understanding you cannot use another card that is playable because you could cheat and switch that card in.