Larva de Rana de labio blanco
This animal was calling in a road culvert. - https://www.herpmapper.org/voucher/56369/full.jpg
under a small rock next to the road. - https://www.herpmapper.org/voucher/5757/full.jpg
This is Leptodactylus albilabris.
This frog was calling from beneath some sticks and grass in a little stream that had formed beside the road after the rain. I removed all the sticks and debris from the frog and it never stopped calling nor did it hop away in spite of my close presence and physical disturbance.
It had rained very heavily here all afternoon and stopped just before dark. - https://www.herpmapper.org/voucher/8039/full.jpg
Leptodactylus is a genus of leptodactylid frogs. It includes the species commonly called ditch frogs or white-lipped frogs. It is very similar to Physalaemus, a close relative, and indeed the recently rescribed Leptodactylus lauramiriamae is in some aspects intermediate between them.