I think that if Naruto was to summon a frog, it would definitaly (sp) be G_____, because so far whenever someone uses their best power they use it to the max, and I also think that Naruto is beginning to save things until when he really needs them (like how in the fights with Neji and Kiba he didn't start using jutsu until he had been hit a few times). Also, I get the feeling that G_____ would listen to naruto because he respects his power and would just want to indulge the little genin because it would be funny.