What is the Southern Chorus Frog's call?

"Crrreeeeek" is the call of the Upland Chorus Frog (Pseudacris feriarum).

Specifically, the voice of the Upland Chorus Frog is a clicking trill that is made very quickly. The inflection is rising. Everything about the Upland Chorus Frog's call is audibly much faster than the very similar voices of the Boreal (P. maculata) and Midland (P. triseriata) Chorus Frogs.