I don't think so, no, and for two reasons.
First, Hitler absolutely hated Americans and viewed the US as 'decayed' and Americans themselves as stupid. He apparently considered some Native Americans to be Aryan, but we don't really know much on that because he didn't talk about it a lot. Honestly, the way the Nazis viewed race is pretty different than an American PoV and I'd argue Hitler's views were probably informed mainly by German Westerns (a genre of Westerns written by Karl May, which Hitler apparently liked when he was younger).
Second, American Fascism at the time was extremely isolationist as others have mentioned, and xenophobic in a different way in that.. they hated all foreigners, basically. The Klan, as an example, didn't just hate Blacks and Jews, but also Catholics, Italians, Germans, basically anyone not Anglo-Saxon Protestants. That's a super simplification of course (and if needed, I can try to find some sources), but I imagine a Fascist America would likely remain neutral in the war and pretty isolated. I don't even know if they'd get involved against Japan.
Theoretically, you miiiight be able to get a Fascist US that may be able to ignore the second and considering Hitler also looked down on Italians but was allied with Italy.. It's possible a US under Hearst (was he really a fascist?) or Charles Coughlin (not really possible) maaaay actually ally with Hitler. Or at least trade.
I think it'd probably be a better bet to get an Authoritarian US instead of a Fascist one aligned with the Axis honestly.