Are black holes found near planets?

Such a black hole is never found, but theoretically it should be possible. If the planets are far enough from the black hole where they circle around they will just orbit the black hole in the same way as they would orbit a star with the same mass if it would replace the black hole. But if it exists it would be very hard to detect, exoplanets are detected because of their interaction with their mother star(They block some light and have gravitational influence that can be detectable), for black holes that is not an option because they are obviously black. The planets themselves won't emit light so there is no way we can detect such a system if it exists.