...'Arcoll,' I managed to croak... 
John Buchan 「Prester John」
...“Must thou croak from every rock we rest on?” ...
Talbot Mundy 「King--of the Khyber Rifles」
... At the sound of our caravan the red antelope bounded away to our right and the left, and frogs hushed their croak...
Henry M. Stanley 「How I Found Livingstone」
...He may—and does—get so hoarse that it is a pain to hear him; but as long as he can croak in good volume he is all right...
Stewart Edward White 「African Camp Fires」
...A rasping, clattering croak,uttered when fighting or in coming to the nest...
Frank M. Chapman 「Color Key to North American Birds」
..."Aharsh guttural croak...
Frank M. Chapman 「Color Key to North American Birds」
...When alarmed,a rough, guttural croak...
Frank M. Chapman 「Color Key to North American Birds」
...)Call of mother to young and of young in reply a guttural,raucous croak...
Frank M. Chapman 「Color Key to North American Birds」
...An abrupt, harsh croak warns theflock that one of their number has discerned a hawk or noticed somethingsuspicious in the air...
John H. Robinson 「Our Domestic Birds」
...And he closed his eyes and gave a hoarse,sad croak...
Abbie Farwell Brown 「The Curious Book of Birds」
...Hiscataract of sweet sounds is exhausted, and his only remaining noteis a harsh croak exactly resembling that of a frog, or the subduednote of a raven, wate-wate or cur-cur...
Rev. C. A. Johns 「British Birds in their Haunts」
...From the cry croak the Raven no doubt derives itsLatin name Corvus the French Corbeau, and its common Scotchappellation Corbie...
Rev. C. A. Johns 「British Birds in their Haunts」
...'This has been compared to the scream of the Missel Thrush; butMacgillivray says it seems to him more like the croak of a frog...
Rev. C. A. Johns 「British Birds in their Haunts」
...Its note, something between abark and a croak, is as well known in watered districts as the noteof the Cuckoo, and is often uttered when the bird has no intentionof being seen...
Rev. C. A. Johns 「British Birds in their Haunts」
...They now have a call-note, though before they have beenquite mute; it is said by some to resemble the syllables pitt-pitt-coor,by others to be very like the croak of a frog...
Rev. C. A. Johns 「British Birds in their Haunts」
...That shot of yours hit the oldbird in the shoulder; he's scared half to death he'sgoing to croak...
John Charles Beecham 「The Argus Pheasant」
...So obviously is its object to hearten thefemale in her long and patient vigil that assoon as the young are hatched the male'svoice breaks like that of other choristers toa guttural croak...
Frederick G. Aflalo 「Birds in the Calendar」
..."The call is a prolonged, raspy, staccato croak, sometimes with arising inflection at the end...
Robert G Webb 「Some Reptiles and Amphibians from Korea」
...The croak of the crow is, moreover,much harsher than the caw of the rook...
Various 「Natural History in Anecdote」
...He wanted to tell her to go back—the amoeba was only feet away—buthe could only manage a little croak...
Various 「Astounding Stories, April, 1931」
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