Your right Kat, My Tree frogs respond to different sounds to. My Tree frogs that are outside start croaking when I mow the lawn. My Southern Bells start up when my partner mimics them and my Green & Golden Bells love music.

My Green and Golden bell females do make a slight croaking noise if the Male is climbing on them. Its not full on croaking, it's not as loud as the males and it's a softer sound. Its the female telling the Male to leave her alone I reckon. Im not sure if Dumpy frogs do this though.