At what age/size do Male Bullfrogs start croaking?

[habeeb]

ellis: how big is ur frog??
stu: i had him in a little rubbermaid lunch bowl thing...but not i have a plastic paint roller tray as their pool lol anything will be fine for ur frog as long as he has bout a inch of room from the sides while sitting in it

[stuartrobertson]

He's just over 4" atm. I've just finished Giant African Bullfrogs: Life History and Captive Husbandry by Mailloux and Vosjoli, it is so concise it's unreal so I'm thinking of changing a few things. Give it a read, you won't be disappointed!

[bullfrog1986]

Hmm not sure how big he is ill have a look tonight. I might even clean him out tonight too..