instead of removing them for feeding.... try the glass bowl trick XD ...I don't know how or why but crickets cant or wont jump out of it. I feed mine each with forceps now because the one frog would hop in and get all the crickets before the other, but used to use the glass bowl and it worked amazing. There are other articles in this site about it as well... its how I learned about it.

Take a small glass bowl doesn't have to be clear, Id say and opening at least as wide as the bottom or bigger for ease of the frog climbing in and out. I used a small bowl about 1 to 1.5 inches high.... 4 inch diameter opening and 3 inch base... MUST BE GLASS and CLEAN and DRY... if its damp or littered with subtrate the crickets can climb out easier.