croak
verb (used without object)
to utter a low-pitched, harsh cry, as the sound of a frog or a raven.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The very simplest and best way to begin this study is to go to the nearest pond, where the frogs have been croaking in the evenings.
From The Log of the Sun A Chronicle of Nature's Year by Beebe, William