I would guess that blue-spotted salamanders or red-spotted newts would be easier to take care of than leopard frogs. Those frogs seem to be big jumpers, and can really get some distance on those jumps, so it would seem they need a pretty big tank.
I have have kept both the blue-spotted sals and the newts (not in the eft stage) as pets, and they are fairly easy to care for. The blue spotteds (A. laterale) become fairly tame and will come out when they see your hand if they think food is involved.
If you are near Selfridge, you are probably fairly close to a population of those salamanders. I myself have found them in Macomb, St. Clair, and Oakland counties. Any good woodland habitat in the area would be a good place to start, and they are often easy to find even in semi-rural backyards under garden rocks, etc until late october.
In fact, I would often see them most in October in the woods in St. Clair.
By the way, I live in Utica, and their are not really any good pet shops in the area that carry any newts or sals. I often see warty newts, cfb's, and taricha newts, but most stores dont keep them well at all.
There is one exception that often has fairly healthy warty newts, but I dont know if you are interested in those. I think one or two of those (not a lot; aggressive) might not be bad as a beginner newt. I can give you more info if they interest you.