I'm a Google Map veteran and have never found a pond that didn't have something in it. Generally, if it has a moderately sized creek that runs into it, or a creek that runs out but isn't blocked by a beaver damn or a culvert it will probably have trout. Around here I have found that most ponds with trout have bass, but some ponds with bass or other panfish won't have trout.
The most important thing a pond needs to support trout is depth. They need cold water to survive and if they can't find it they won't make it. A good example would be the "Honey Hole" out by EE Wilson. Big bass, catfish, crappie, bluegill and perch but not a trout in sight because it's only 12' deep. They could stock it but they would still die off in the summer.
If you find a pond that you think not many people know about, first of all let us know
hahah just kidding. Feel free to keep it to yourself, but walk around the bank and try to spot minnows, or bluegill etc. At that point then try to determine if it might have trout.
Have fun!