i dont think that he would be able to summong those toad because jiraya knows them personaly and thats why he can do it the body it self cant do it .It would be exactly like with naruto he would not hear him.
I dont want that pain take j mans body THat would be a profanation of his name.
Sure it would be a disgrace to Jiraiya's name, but Pain does not care, he'd do whatever he can to obtain what he needs. Pain could control Jiraiya's body to form a blood contract with one of the toads. Its not as difficult as it seems really. The type of summon is determined by the amount of chakra used. By using Jiraiya's blood and the specific amount of chakra, Pain can summon any type of Frog, although the problem with that is whether the Frog would listen. We know that Pain has a connection to dead things, perhaps Pain killed off the summons in the past, than used the Rinnegan to control it, therefore he is able to summon so many types of animals.