You misheard, it's plain old Führer, a reference to Phibun's borrowings from European regimes of the period. I'd consider him more comparable with Mussolini than Hitler, but such inspirations weren't uncommon among nationalist stongmen or authoritarian movements of the global "periphery", generally inspired more by fascist models of superficial national unity enforced by top-down discipline than by the rabid racial mania epitomised in Berlin.