Hi Unke

You should look at the site (and forum) of DGHT: Deutsche Gesellschaft fur
Herpetologie und Terrarienkunde. Might be a lot easier to explain everything
in your own language.
You didn't tell us anything about the habitat-conditions your toads spent
almost a year, size, lighting, temps, ventilation etc. Were they well-fed before
they went into the fridge? Food? Let me guess: crickets as a main course.
Not a good idea. You definitely should try earthworms for food
Another bad idea: playing with them. Buy your sister a hamster, barbie or whatever,
but leave the toads alone. Poor things.

Han