Frog with sagging skin and able to get of cage help

[poaponies]

My frog it seems his skin is very sagging looking and I think be is overweight, but the sagging gets worse. It i put him on a diet I need help on feeding him.
My second question is that he will escape for his cage how do I stop that
thank for helping me

[Paul Rust]

We need a little more to go on. Can you post some pics of the animal and the enclosure please?