Lençóis Maranhenses National Park

The dark patches on the sand dunes are water pools formed during the rainy season. Even fish can survive in this intermittent environment. I wonder if this figurine was found in these dunes. Allegedly, the Caete indigenous people resided in this area until it became covered with sand. If this figurine was created by them, it looks rather recent, possibly depicting someone encountered at contact?  
Thank you Silvia!