What animals besides fish can be put into a 1.5 gallon tank?

Shrimps are the only thing. Frogs need 5 gallons or more even as babies. Hermit really need a 10 gallon set up or more. Snails would work but your mother doesn't like snails. And that goldfish is going to need a 20 gallon tank or more. I would just re-home the gold fish.