African Clawed Frogs do shed their skin. This is perfectly natural.
They replace old skin with new every few weeks when they grow or when it's worn.
It looks like a thin film coming off and they usually eat it after shedding.
Excess skin shedding can be a sign of skin parasties or pollution or chemicals
in the water.
Healthy Shedding should only take a few minutes and the frog eating it gives it extra
health as the skin contains anti-biotics and good proteins etc.