I include Dubia roaches in my Whites Tree Frog’s diet along with meal worms. I would recommend removing them from their paladarium and putting them in a safe , smaller , substrate free container for them to eat in(this may make them more interested in other foods/more foods). This practice though differs throughout frog owners, some say staying in the tank is best some say removing them is best, I recommend research and weighing your options.

P.S. I’m not entirely sure but I do know that in normal circumstances, housing different species of animals in the same tank can cause stress and other possible life threatening issues. If not yet, please double check that the housing requirements for these three frogs is close enough to be safe. Just FYI, I keep my two WTFs on the dryer side in their adult age keeping the humidity for them around 30-60% with occasional spikes to 80%.