Summon a Naterran Great Tree token. If Overflow is active for you, summon up to 2 instead and give this follower Rush.
QIf Overflow is active for me, can I choose not to summon a Naterran Great Tree token with this follower's Fanfare ability?
AYes. "Summon up to 2" means you can summon 0. Also, if you choose not to summon a Naterran Great Tree token, you can still give this follower Rush.