lol ok

to use a moss is not going to happen with pacman, it posses a very high impaction risk.
with those guys simple is a key, you need to take everything apart and change completely substrate every single month. with the amount of waste they produce and lightening they need close to none live plants will survive.
you need - medium sized critter keeper ( if you are to get a baby), plantation soil ( or eco earth), shallow water dish, some decor, artificial plant or log or both, something to create a hide of some sorts.
you will also need heating lamp/pad/something + fogger ( or you'll need to mist it constantly) + hydrometer and thermometer ( get digital, majority of analog ones are garbage)

prime or something like that to treat your water that you are going to use for a frog
ca/vit3 supplement and multivitamins.

and a frog!

and when a baby is bigger you can upgrade him/her to a bigger tank