User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-28303251-20130803064921/@comment-429226-20130804115345

Frogs don't have the necessary muscles to chew their food. Instead, frogs can actually use their eyes to force their food down their throats. This is why it looks like a frog is blinking when it is eating. It's because its eyes are actually sinking down inside of its skull to push down on the food.

I copy and paste is info somewhere but yep...