Oh, I spotted these on the toy shelves where I work! I thought the idea was cute, it looks like you're chipping little yeti monsters out of icicles or ice pops. ^_^
Personally I'm not a fan of having to dig toys out of slime/wax/sand/etc., but I know it's very popular today with the kids. Having an interactive toy like this, that combines interaction with the "reveal" is like a double-pop to entice the kids to want it LOL. I'm glad they can be bought second hand without having to go through the whole interactive experience of getting them out LOL. The kids are happy and the collectors are happy!