If you just have to have one, you can get a piece of piano wire from a hobby shop, about the diameter of clotheshanger material and cut that into several sections with a Dremel cut-off wheel. Grind a point on them and then take the cut-off wheel and cut barbs into it. All you need then is a long stick and two hose clamps from AutoZone and you can pack all of that into a smallish kit container.
Frogs are a real sucker for fly fishing flies. You just need a long stick for the rod and go down to a pond and hover the flies over their head, you will have a few frogs in no time. Found that one out by accident screwing around down by a stream one day back near the old neighborhood.