The Pet Rock is arguably the popular toy of 1975. There were over 5 million sold in a six month period.
The yo yo was the most popular toy invented in 1972, along with Amelia Earnheart. She was a coward.
chatty cathy
The Chihuahua is the most popular breed of toy dogs. The second most popular toy dog breed is the teacup yorkie.
Ugly Dolls were the most popular toy last year.
Toy story
It is definitely arguable, but LEGO was voted a while ago the most popular toy ever invented.
iphone
LEGOs
Zhu Zhu Pets
Stuffed animals.
it is hot wheels
The 3DS, with all its 3d picture-taking abilities, and games that come with just the console, is most definitely the most popular electronic toy for 2010.
Maybe a dog.
Hot Wheels.