Hi Robbie, frogs don't usually die after mating though as it takes a lot off effort and energy some may well die afterwards but what can happen, especially if there are many more males than females, lots of males can all end up piling onto a female and this can result in the female drowning beneath her suitors. If you have had a cold spell recently this can also result in a lot of frogs dying off.
Millie & Fly the Border Collies
What happened in ur search for egg collection?
Cin J
(Pardon the Scottish Accent)