Using a melon organ on land. Plausible?

In my story, set in an earth-like world, a marine species that had evolved a melon organ, much like that found in our dolphins, made its way back into the "land" (a large system of underground caves), re-evolving its limbs and making use of its echolocation to thrive, as the other predator species of the cave had basically gone extinct, leaving the niche open.

The re-evolution of the limbs and specialization for climbing apart, is the use of its melon organ for echolocation viable on land? To what extent does the change from water to the air alters the way this organ functions? The cave is mostly devoid of light, making this ability necessary.

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Using a melon organ on land. Plausible?

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