It has been a few years since I have been there, but I remember there was a Build A Bear at the Disneyland version of DTD and there was also a Rainforest near by, so maybe that is what you read about. There isn't one at the WDW DTD.
When we were at DL there was a Build a Bear at the DTD area. It's been a few years for us too, but I got DD a bear with the entire Mickey Mouse outfit; ears, gloves and shirt.
There's a Build-a-Dino at the T-Rex Cafe, but there are no Build-a-Bear Workshops on property. It's too bad, they make some serious $$$$ at Disneyland.