It's ok to offer food daily, but don't over feed. They will normally stop when full. A 3.5" Pacman should be eating 10 to 12 adult crickets in a single feeding so you could offer more. You can offer food every other day if you are worried about over feeding, but many will eat everyday if you offer food. It is best to offer every other day to every 2 days for adults though depending on the size of the frog and how large of a meal.