Used to have same problem. wash hands have a large bowl that the frog cannot jump out of with fresh water. 2 methods. first method with bowl in lap and cricket in hand, hold the frog with your thumb against chest. other fingers supporting him. you can usually lightly tap the mouth from the corner around to the other and after a few tries he will normally pop open. helps especially if hes pissed to have another person with the food. 2nd method is the same but take a smooth card hotel key id... and from the corner of mouth gently slide in he will open just to get the card out, if it takes a few tries use the bowl and place him back in if you cant get it after no more than 3 minutes. wait a hour or so and try again if u force feed a few times they learn what you are doing and will pop open just by first tap on mouth.