What was Jiraiya's nickname for Tsunade growing up?

Jiraiya's nickname for Tsunade growing up was "Tsunade-baba," which translates to "Old Lady Tsunade." This nickname reflects his playful teasing and their close relationship as childhood friends. Despite being a term of endearment, it also highlights Tsunade's tendency to be serious and responsible compared to Jiraiya's more carefree nature.