Im pretty sure all frog shed. most of the time when I catch any of my frog sheding
I allways see them trying to " wipe " their face or right where their eyes are.
the gasping is just them trying to slough the skin up to the mouth.
as for what was stuck to him a pic would be great but if he was burrowing then it
might just be substrate.

There might be a bit more info in L. vermiculatus on thefrog.org.
are thes leptopelis or uluguruensis.