Looks like a severe prolapse alright.

It's best to contact a vet to help you out.
You need to figure what is the underlying cause to this.
May be anything from digestion problems to internal parasites,
ruling out the parasites will be one of the first steps.

Most of the times a prolapse is caused by digestive problems (hard parts or stones etc.) and clears itself within a day or 2.
Best thing to do is take it out of the viv and place it in a clean temporarily enclosure, sterile as possible.
You may wan't to soak you're frog in a saline solution, 1 Liter of luke water mixed with 6,6 grams of iodine free salt, you may mix in a teaspoon or 2 of honey.
Let you're frog bath for around 15-20 minutes and put it in the sterile environment and give it some rest.

If the prolapse is still present after a day or 3, you might wan't to visit a vet.
The intestine needs to be massaged back into the body, wich may be tougher then it seems.
Frogs are verry delicate, internal damage or damage on the intestine can be done rather quick.
In some cases it may be necessary to give it a stitch to stay inside, or in severe cases part needs to be amputated under anesthesia.

Hopefully this helped you out a bit.
I understand the temptation to just push it back in,
but consider it's a verry delicate matter,
if you damage anything the frog will be worse off.