Pacmans do not overfeed. Would give it all food it will consume at night until satiated (loses interest). Can try rubbing earth worm pieces in frog lips to get it to strike worm. Use a ZooMed plastic tong or a rubber tipped metal one; not your fingers. I do not feed night active animals in morning because going to sleep on a full stomach can create chronic health problems in time.

To maintain humidity can use Saran Wrap or aluminum foil taped to top and block 50% of screen. If not enough can increase coverage but keep an inch away from hot light fixtures.