Do they sell freshwater fish? I don’t see anything aquarium related in the pictures.

No they don't... You can try fish hut on route 46 in saddle brook... They have a great selection of all kinds of fish

I know they have aquatic frogs, but as far as fish I'm pretty sure that's a negative. But it wouldn't hurt to call them I'm sure they have recommendations or they can point you in the direction in which to go 💚