Swappz.
The figures are about 3 inches tall and on keychains. You scan the bottom of them to play some kind of APP game.
These are at Dollar Tree right now for $1 each. I thought I got lucky and found all four turtles -- but it turns out there are 2 versions of each -- so the set is 8.
Dollar Tree also has Swappz.for the Smurfs and the Power Rangers.
I'll probably open them up soon -- I just wanted to give a heads up.
These were $8 each when they were at Target.
Here is an article describing them. The article says Trash Pack was going to make some too, but that did not happen.
http://www.nytimes.c...anced-toys.html