'croak' is a correct and usable word in written English.
You can use it to refer to an animal or person making a deep, low sound, especially a frog. For example, "The croaking of the frogs in the pond could be heard from miles away."
There was no trace of human life, only the croak of a raven and a trickling stream.
We can never go back, of course, and not all of it was brilliant, but if the time does finally come for international cricket to croak it, who wants to bet that it's not with a well-paced tri-series or a 6-Test Ashes battle, but another bloody seven one-dayers between India and Sri Lanka.
By the time a ship's officer called Joseph Conrad got to the bar he could croak only "of wrecks, of short rations and of heroism".
The occasional croak drifted down from on high as a raven returned to the Temple of Heaven.
With the oil-lamp flickering and the croak of frogs outside, it was an atmospheric place to spend a couple of nights.
Not that the couple need help, being accomplished singers: Buddy's voice has the age-worn quality of driftwood, while Julie's breathy croak recalls Rickie Lee Jones on songs such as "Don't Say Goodbye" and "A Long, Long Time".
A symphony of tree frogs is in full croak, a silvery half moon casts shadows across the humid night air.
Francesca Annis's rich, bored Joanna – chic but with a rough croak – is very New York.
Bumblebees tap against my windows, pheasants croak their way across my front garden and lambs play together in the field I can see from my study window.
"I did it because they told me — " he started, but he choked on what he might have said and his voice was a crow's croak.
