They also generally use the kind of frogs you might record in, say, Griffith Park in Los Angeles if you want to record a frog sound. Which is why I, originally from Indiana, never heard a frog like they usually sound in movies until I went to Griffith Park after a rainstorm.

Frogs in Indiana (or at least the two parts of Indiana where I grew up and where I am living now) either cheep in a way similar to crickets or make a sound almost like the sound a rubber band makes if you pull it tight and then pluck it.