The Pet Rock is arguably the popular toy of 1975. There were over 5 million sold in a six month period.
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.
LEGOs
iphone
Stuffed animals.
Zhu Zhu Pets
it is hot wheels
The French Bulldog has become one of the most popular members of the toy dog group. Known for their charming personalities, compact size, and distinctive bat-like ears, French Bulldogs have gained widespread popularity in recent years.
Maybe a dog.
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.