This sound effect can be found on The Premiere Edition Volume 1, which was made by The Hollywood Edge. The frog croaking element is similar to SWAMP, NIGHT - FROGS, INSECTS, BIRDS AMBIENCE, which is available on Series 3000 Ambience Sound Effects Library, although in it, the croaking pattern is used in a high pitch.
Sound Effect Description
Swamp Ambience 2 [special Mix]; Light Chorus Of Frogs Croak, Distant Perspective, With Insects Lazy Chirps, Medium Distant Perspective.
Clean, Full Length and Unedited Link to the Sound Effect