Okay #nerdstodon, we need a word!

Bookstore Baby is a fan of Chef Gonger, who duplicates syllables in the middle of fruit names, e.g. bananananas, cranberberries, pineaneapple... what do you call this kind of infix?

#linguist #linguistics #EnglishLanguage #GrammarQuestion #grammar #words #SesameStreet #ChefGonger #CookieMonster