No, it will only help the itch and it will not kill the fungus. You can by miconazole nitrate over the counter and use them both together. So the triamcinolone will help the itch and the miconazole will take care of the fungus. A word of caution on using any topical steroid is that they will thin the skin so be cautious when using them. Use only as directed and when the fungus is gone stop using the steroid.
To help keep you dry and to help prevent future jock itch problems trying using a powder called Zeasorb.