Board Thread:Boruto Discussions/@comment-33545035-20200720150908/@comment-3523655-20200722173639

X440z wrote: Also, I wonder if Koji had to make his own contract with the toads. I assume so, because even though he's created from Jiraiya's DNA he himself is his own person so Jiraiya's contract wouldn't work for Koji.

I don't think he needed to. I think there's a story there, where he accidentally summons a Myoboku toad, and they're like "uh, you're not Jiraiya!" which led to some conflict, which led to him only using the Boiler Toad and a few other small frogs.