bath seat? bath chair??

Baby is quickly outgrowing his bath tub cuz he's so dang tall. We occasionally co-bathe but that's not always practical. I saw a photo on this app somewhere of a baby in like this plastic seat in the bathtub. Kinda looked like a bumbo, but it goes in the tub for them to sit in during a bath. I typed in "baby bath seat" and "baby bath chair" into Amazon and nothing even close came up. What the heck are these things called!?! We need one 😬 thanks!