Thanks guys.
Its really hard to find any real information about the stuff I bought.
It is 20 gauge, "painted" wire from wal mart.
Walmart.com: Stem Wire: Crafts
Ive buried all the exposed ends into the polyurethane, but I think over time there will probably still be corrosion issues. I am worried about that being a problem for the frogs with all the water and humidity. None of the wires will be submerged, but they will probably be exposed to water and high humidity...