Ed,
While I have not had any frogs lay on the vivarium glass, I had a similar situation with my azureus in the past. I used a shallow glass ashtray (sterilized of course) as a laying dish. The azureus laid a clutch on this dish and I wanted to remove the eggs, transfer them to a plastic petri dish (which I should have used to begin with). I found that a sterile, sharp razor blade did the trick. It took alot of patience and care when removing them with the blade. Press the edge of the blade against the glass, just ahead of the clutch and slowly slide this under the clutch much like with a spatula, being sure that the razor edge is firm against the glass. If the clutch is large, you may not be able to fit all of the eggs on in one move, so you may have to seperate them and slide them apart and remove them individually. Hope this helps.
-Bill J.