This might not be a new "toy" per se, but it is something I've often pondered about but never seen, until someone mentioned it in the chatroom yesterday.
Pipe cleaners between the toes.
Apparently Mimi can speak from experience about this. Does it actually work?
If so, Im patenting the "pipe cleaner rake", taking four of them and connecting them to either a fifth pipe cleaner or some other surface to slide between all the toes on one foot at the same time.
Stay tuned for the future catalog from the TMF, "Tickle Toys to Grow On"