What are you trying to feed him/her? Crickets for a baby Pacman should be no longer than the distance between your frogs eyes.
Are you trying to feed him/her by hand/tongs or forsepts/or are you just placing the food in for him/her? You can breack the hind legs off of the crickets so that they can't jump and are easier to catch.
What is the temperature in the enclosure? Babies should. Be kept at 80F to 82F during the day and 75F to 79F at night, but the night temp should hover around 78F. Humidity needs to be at 80% and maintained.
Do you have 3 sides of the tank covered with some kind of background? If not you should to make him/her feel more secure.
I believe your frog is very scared of you and is becoming very stressed because of this. It takes time for them to adjust to a new home and new surroundings. You should. Not worry until well over a week. If it takes longer than a week then we may have to suggest some other methods. For now try not to worry and don't hover over him much. Just throw some food in with him/her at night and leave him be. Check in the morning to see if he/she has eaten any.
Do keep us posted

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