I don't know what you could do about this. It's disgusting. These set-ups are cheap; the people who buy them are totally ignorant of the requirements of the animal they are purchasing, and get sparse or incorrect information from the seller. But when the animal almost invariably dies, it is easily replaceable or the entire thing can be tossed without much loss. The pet shops who sell them have no policy of conscience. Some life is too cheap, and can be obtained wholesale, then retailed out to the general public willing to fall for a promotion on a whim.
I'm guessing this is an African dwarf frog, or perhaps and African clawed frog. They can be purchased for less than a loaf or bread or a head of lettuce. They need proper care, including preferably undergravel filters, regular partial water changes, and the right food and temperatures. (The clawed frogs are less particular about temperatures.) They are carnivors, so need things like blood worms, brine shrimp, water fleas, and pieces of fish, not the so called "amphibian pellets" or fish flakes designed for omnivors. They do best in water from 7 to 10 inches deep, but with a capacity of 2 gallons minimum for one or two frogs. The shallow water helps them come up for air, as they are air breathers and don't have gills for underwater breathing. The water must be chlorine free, and free of other contaminants. It must always be clean and free of ammonia and nitrates from wastes.
This kind of care does not happen on top of an office desk with week-ends off.
I'm not sure if they get lonesome alone. The only association with each other my African dwarfs have is male/female interests when breeding. Otherwise, they independently go about their own frog business. They do better without tropical fish company, and the fish do better without them, especially without the African clawed frogs.
I can't begin to advise you how to handle the co-worker situation with tact. It depends upon your relationship with your co-worker. You can't come on as an authority because you admit you are not. If he/she doesn't know this yet, maybe you could fake it.
-----
Patty
Lost River, Idaho
4 D. auratus blue
3 D. galactonotus pumpkin orange splash back
5 D. imitator
4 D. leukomelas
4 D. pumilio Bastimentos