Yeah tsunade saved his ass by taking his sword he could have done the same thing she did in the situation, in addition the only way manda got the jump on him was them creating a smoke screen for mandaJ(not that it matters with sage mode sensing), what argument did you give he has nothing to counter frog song.
Go back and watch the episode, Manda was controlling the entire fight. It went something like this.
Katsuyu uses Acid Slime, Manda dodges, constricts Katsuyu
Manda goes to strike Tsunade, Gamabunta goes to stab Manda.
Manda reacts and catches the sword in his mouth.
Katsuyu splits herself, and regathers, Gamabunta jumps back.
Manda throws sword at Bunta, Bunta dodges, sword lands in front of Katsuyu and Tsunade.
Jiraiya and Bunta use Fire Style: Toad Flame Bomb on Manda, Manda substitutes out of it and goes underground.
They FEEL him coming underground, but he fools them with his tail, and strikes from behind.
Tsunade comes out of nowhere with Bunta's sword and finishes the battle of the giant summons.
Manda easily dodged or countered every attack and easily got the jump on them.
Kishimoto stated himself, Snakes beat Frogs. It's just the natural order of things.
Also, as far I've seen there is no character in the series at any point other than Tsunade depicted to be strong enough to lift a giant sword a hundred times larger than his or her self.
As far as Frog Song, my argument was that the only way it can work is in a situation like the one with Nagato, in a setting that's basically a giant maze. The only reason it worked is because Jiraiya was able to hide from them. If Orochimaru and Jiraiya are in an open battlefield like where the three sannin fought, then Frog Song just can't work, because Orochimaru isn't going to sit there and just let him activate it. It requires too much prep time. And as far as any distractions, be real, do you think a Shadow Clone will hold Orochimaru for more than a few seconds? For every one of Jiraiya's frogs, Orochimaru has a giant snake waiting. So whether or not Frog Song is Orochimaru's achilles heel all depends on the setting of the fight.