What is the toy advertised on the Saturday cartoons that is a tower where you can grow stuffed animals inside?

My son asked for this toy for the holidays but all he can tell me about it is that it is a tower where you do something to it every day and then a stuffed animal grows inside it and eventually pops out. It was also described as "tall". It is on the commercials during the Saturday morning cartoons on WB - I think during Dinosaur King. What is the name of the product so I can buy it for him? Thanks!

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