Absolutly. I figure the thing you're thinking about most is feeding it, right??
There are alot of ways to ensure the frog has a substantial food source, but generally most people don't like them very much. Usually you'd feed captive herps crickets from the store, but that's not really a great idea in this case . . they'd likely just run all over the place and not be consumed.
The best way to ensure a bullfrog in a backyard pond is fed is to make available several foodsources for him. There will naturally be bugs around the pond, so that's one. Another way is to stock your pond with smaller frog species and some tadpoles--it'd definatly make use ot that . . . same thing with feeder fish. If you occasionally put feeder goldfish in the pond, the bullfrog (as a regular resident) will probably pick them off, too. The final way I'd say to ensure the frog has a foodsource would be to put a birdfeeder right by the edge of the pond. It may sound brutal, but a large bullfrog will have no problem picking off the occasional small bird, and with a feeder dropping seed at the edge of the pond, the bullfrog will have his pick.
Aside from a food source, its a great idea to make sure the frog has places to hide and some relative cover on the edge of the pond. Plants in and around the water (which are usually a standard anyway) will do just fine. They'll also provide for other species creating a more complete "ecosystem" of sorts. They also like hiding in between rocks in occasion, but that's also usually a standard.
Anything else or anything more specific, just lemme know!
-Bob