Why does the water look this way? Eggs?

[Jenste]

wow. Yea the film on the top of the water and the sides of your tank are from poor maintenance habits.

The film on the glass above the waterline shows us the progression of evaporation - It is not eggs, just dirty. The film at the top of the water is also not eggs, just filth and most likely tattered pieces of shed skin that the frogs did not eat. I would guess that their shedding is not coming off in one piece but in several, an indication of poor water quality.

Weekly water changes should be done, as well as having a filtration system. Make sure you are treating the "new" water you are placing in with a dechlorinator - - I recommend you dose with Stress coat and Stress Zyme.

When you do the water change - use a siphon to suck out water from the bottom of the tank (this is where the majority of the waste and rotten food will be).

Like Terry said - pick up a water test kit.
Ammonia and nitrite in any amount is bad - nitrate will be present and is not alarming.
ANY reading above 0.00ppm of ammonia and nitrite is a problem and indicates that a water change must be done immediately.