Juiced Scrambler, Rize Blade, Super 73 among others have gotten inspiration of following motorcycles.
That frame type is first and foremost, not bicycle.
They did not evolve from bicycle, they're clearly based on motorcycle and obviously people will use it as scooter.
(This is not to say they can't be pedaled, but as you can imagine, unadjustable bench seat and all that, so called "scrambler" ebikes evolved from motorbikes)
Although in motorcycle industry, there are Ducati Scrambler, Triumph Scrambler, etc... but that would a different debate.
Anyways, the ebike version of scramblers got the inspiration from these motorcycles.
For example, I was able to find a motorcycle as old as 1969 Kawasaki Coyote.
Kawasaki Coyote
Coleman CT200U
Bonanza Minibike
Doodle Bug
Baja Mini
Taco 100B
American Racer 215