Does anyone know who this is

T octopus

Is this not on the catalog because it is an exclusive from a lego store display frame.

BrickFreedom

It's the minifigure from this item:

https://www.brickowl.com/catalog/lego-minifigure-collector-frame-5005359

Look like inventory for figure is not available.

Jay37

He goes by the name Beach Party Dude. The set (5005359) here has not been inventoried and a quick search suggests he's not yet been added to the catalog.