Take a picture of the frog so we can identify it.
Ask your Mum for a clean plastic bin that you can use and line the bottom with paper towels that are moistened with bottled water and if you keep
fish use treated tap water. ( better)
make some 4to 5 mm holes in the lid so it can get fresh air.
place the bin in an area where it is quiet and not too warm or cold. around 22c
and please send a photo of the frog and a close up of the legs.