Hello and welcome to FF! A small baby Pacman (imagine it is) requires daily feedings. First thing recommend to do is is to read this: http://www.frogforum.net/content/pac...-breeding-170/. Pacman's are easy to keep if you meet it's enclosure space, temperature, humidity, and substrate requirements (all in the article). If you have moss in enclosure (Petsmart uses it) do replace that with shredded coco (ExoTerra's Plantation Soil or Zoo Meds Eco Earth) and add some dechlorinated water until it clumps in your fist but does not drip.
Also, have a clean dechlorinated water dish (changed daily) that frog can soak in filled to frog's chin level.
Finally, get some calcium and vitamin powder supplement (recommend Repashy's or ReptoCal) and dust food 2x a week with CA and 1x week with vitamins on different days with a skip day in between. Other than that, gut load the crickets with chopped vegies and also offer earthworms (best food for them), can get night crawlers at pet shops or Walmart's sport section (ensure they have no additive dyes). Good luck and share pictures please!