Hello and welcome to FF ! If interested in Pixies, do read this care article: Frog Forum - African Bullfrog - Pyxicephalus adspersus - Care and Breeding.

A small female Giant or Dwarfs will fit for life in a 20L; but a large Giant male won't and will eventually need a 40B or similar. Recommend start a Dubia roach culture and find a local source for not dyed night crawlers. You will need lots of food to raise a GABF to adult.