cap10 said:
Kinda looks like the scavenged head of an AT-DP , a concept walker from the Rebels TV show, as if it was hollowed out and used as a helmet!
Makes sense with all the wreckage left over from the Battle of Jakku.
(The design is also a fair bit older than the Rebels TV show. Apparently it's taken from the original concept drawing of the AT-ST's in ESB.)