Frogs shed at least once a week (mine does anyway) And yep, if he looks like he's burping or about to barf and has stringy stuff stuck to his arms or coming from his mouth, he's shedding his skin.Girl frogs do it too. Frogs are weird, they eat the stuff. I read somewhere it had nutrients in it. Blech.
It's super duper gross to watch, bunt once your little guy is done. his skin will be all shiny and pretty looking.