While I have no experience with using gloves with frogs, I have tried them in the past with snakes, and while they do protect your hands, they can damage the offending animal's teeth and gums.....but of course since a Pixie's teeth are different than snake teeth they may work.

To me, when wearing gloves you sacrifice mobility too much to make them worth it.....the thicker the glove, the stiffer they are usually. I wonder if something like a thick rubber glove might serve the purpose?

That being said, I think the people looking to make their frogs more "friendly" are searching for a lost cause.....frogs inherently are not "friendly" towards humans. We are a potential predator to them, and no amount of anthropomorphizing will change what they have evolved into over the last few millenia. It seems that it is just in their nature for some specimens to be defensive.....its a trait that they have and no amount of "frog cuddling" will change that lol.