According to multiple reports, Ariana Greenblatt has signed on for the role of Tiny Tina. Greenblatt is an up-and-coming actor. She appeared briefly as young Gamora in Avengers: Infinity War. Some of her other credits include Scoob! providing the voice of young Velma, The One and Only Ivan, Love and Monsters and the TV series Stuck in the Middle. Roth had this to say about the casting news in a statement.
"Ariana is a spectacular new talent in cinema. She has already worked with many of my close collaborators and everyone raves about her.