What is the Relict Leopard Frog's call?

"Chuckleluck-chuckleluck-chuckleluck-chuckleluck" is the call of the Relict Leopard Frog (Rana onca, Lithobates onca).

Specifically, the voice of the Relict Leopard Frog is a rapidly repeated series of chuckles and grating notes. It is similar to that call of the Lowland Leopard Frog (R. yavapaiensis). The call tends to be given underwater and during the months between February and April as well as in November.