Agree with your thoughts and would not use any metal studded or gloves made of metal fibers for same reasons we do not use metal tweezers. This page although of commercial interest has good info on glove selection and one of it's references takes you to an OSHA page on gloves:
Cut Resistant Glove Selection and Use - Document #301 - EZ Facts Safety Info - Lab Safety Supply . Literally, think we would want something offering both cut and puncture resistance.
There are specific gloves made for animal handling and if you Google "bite resistant gloves" will get to places like:
Laboratory Safety Gloves - Kent Scientific Corporation with info and offerings.
I have no knowledge of how an African Bullfrog would react to biting a gloved hand. Tend to think the synthetic material would be released within a few seconds. Stilgar once jumped and bite a fake plant in his tank during feeding and released it moments after. Did chomp off half a leaf of it, he, he, he. Good luck and hope this info helps you.