The first thing I was doing as a dad with this sweet little frog was to put himself in the mouth. I chewed two minutes hard on the little guy and I can not taste besides a slight rubber touch. Neither color nor shape I could affect the regulated entities. Now Junior is plugged and the Frog always happy in his mouth, when the next tooth in the jaw press. The small knobs make this noise, which the reputation of a growling grass frog comes pretty close.