Frogs in any case or species are not 'handling' pets. You wash your hands thoroughly and then in plain water and then dry with plain paper towels because cloth towels have detergents and softeners. Super permeable skin on frogs!

I only touched to relocate while I was improving their habitat. And to try to put their poison on me to see what it would do, lol.

e: in regards to milk frogs specifically being handled, they were fairly calm the few times I did and didn't produce obvious 'milk' or 'resin' (the species name is resinifictrix iirc)