This creature is called "the trouser snake". They were first found in Brazil after the Medeira River was drained, their outside skin makes it look like they are giant grey penises :
Die Laughing' - Horror-Comedy Anthology Features 'Trouser Snake' and More Horror Shorts - Bloody Disgusting
Trouser snake : r/ProperAnimalNames
Yooka-Laylee's New Character Is a Trouser Snake - GameSpot
trouser snake | Reptile Forums
Trouser snake Acrylic by Luke Chueh | Trampt Library