I don’t really have a name for these, but I generally call them ‘bichos’ (which is a generic term is Spanish for bugs or insects). What makes them really effective is their big googly eyes; when they look at you, you think they’re real. You can buy the eyes with the finger piece from the shop Tiger, and the other eyes you can buy from craft shops or order in bulk cheaply from China via Ebay (though they take a long time to arrive). Think about actions that they can do and get your class to call out instructions such as ‘Jump! Walk! Sleep!’. Remember that they are more effective when walking around on something, such as up your arm or (as in the photo below) on your hand.