Sondors do a range of Fat Tyre electric bikes. It's cheap but it's a great bike for the money. The electronic parts are Bafang and high quality but the bike is about the quality you would get from any Walmart Fat Tyre bike - cheap but heavy.
There's a number of fat tyre ebike makers. I am a Sondors owner, sure it's a cheap Chinese ebike but you can do lots of modifications to make it much better.