From Nookipedia, the Animal Crossing wiki
The Bear Set, formerly known as the Teddy Bear Set, is a furniture collection in the Animal Crossing series made up of a family of four teddy bears. The mama is medium sized, the papa is big, and the baby is small. The Mama Polar Bear was added to the set in Animal Crossing: New Leaf and the name was shortened from the Teddy Bear Set to the Bear Set.
Doubutsu no Mori, Doubutsu no Mori+, Animal Crossing, and Doubutsu no Mori e+
Animal Crossing: Wild World
Animal Crossing: City Folk
Animal Crossing: New Leaf