That's one of the things I listen for each spring.
If you want a laugh, watch the '50s monster movie "THEM" about the giant ants.
Listen to the sound the ants make and tell me you don't hear the spring frogs!!
First time I really heard them was along a roadside marsh near the Concord River. I was riding my bike along the road and stopped when I thought I heard a strange noise coming from the marsh. Once I stopped, the sound became more pronounced and I stood there laughing out loud saying "That's where they got that sound from!"