Hello Sheldon! Have you read this:
Frog Forum - African Bullfrog - Pyxicephalus adspersus - Care and Breeding? You should feed it what it will eat in 10-15 minutes and no more. You can cut earthworms length to around frog's mouth width and either tong feed or just drop them in front of mouth and let frog pick them up. A low dish tray with pieces will work too if frog is OK from feeding off it.
If frog is really small and one night crawler is too much for one feeding; can cut up to 1/2 worm off from tail (pointy) end. Worm will heal until used next day. Good luck

!