This enables the frog to eat, in one gulp, food that is unwieldy (like earthworms), or nearly as wide as the frog's head. The frog is adapted for swallowing prey whole; there are no frog features for killing the prey first.
the frog captures its prey with its long, sticky, tongue. then it uses its teeth to hold the prey. Finally it uses its eyes to squash and push the food down its throat. It catches the prey in his/her mouth the blinks to "swallow" the food.