Yeah I would only use the jump start method from a friend who has a healthy well established tank. Mine came from a friend with a 75 gallon tank with a full grown Oscar and a very large Pleco and I knew both were healthy. The only draw back to getting used media from a LFS is that they usually used a shared system so if one fish has something, it effects a lot of other tanks. In return I was able to jump start my 40 gallon breeder with the media from my 20 gallon by placing the media bags into my canister filter. It is a great method, especially if you decide to get an additional tank down the road.

Don't let me dissuade you from using used media though, there's really not a lot of *fish* diseases that affect ACF (someone please correct me if I am wrong here..). I know I once kept my my first frog with a few zebra danio which developed Ich and my frog was never effected.

The sooner you can cycle your tank the better off your frog will be. These frogs are pretty much long lived and bullet proof hardy animals so long as you meet their basic needs.