Welcome to Frog Forum.

I'm afraid that you may just have to deal with creepy crawlies if you plan on keeping this species. You can use the Samurai Pacman Food and they suggest using it exclusively, but I don't believe it has everything they need. As a matter of fact it has a few things they don't need.

I would just follow what you've read or search this forum for more feeding info. There is plenty here and if you do get yourself a Ceratophrys I'll be seeing you in the Pacman Forum Area.