Only thing Deidara can do to that has any chance of stopping Jiraiya is C4 and C0, and he can avoid those through either reverse summoning or hiding inside of Bunta or another large summon.
Frog song would paralyze Deidara long enough to be able to hurt him. Gama Rinsho would be the end of him. But it's doubtful Jiraiya would need to even resort to those.
Lol at above, if it were that easy Sasuke would of done it U_U
It takes time for frog song to get into affect... a long time, Deidara would most likely be on his clay bird, no Def. Will be once h begins to hear it all he needs to do is travel upwards to escape the sound, Not that hard,
he does not even need c4 really, How does he counter C2? ... He simply can't especially if he does not start in SM
Fros breath don't they Mini Bombs=dead frog
No iv'e been over this a simple St rendered the frogs unable to fight, C2 takes care of them , or C1's to the eye's