By today's US standard, sure.
In Indonesia 40 years ago that would have been one fat kid.
Not morbidly obese, but contrast his face with those of the other boys in the picture and you can see why classmates would have thought him fat.
Here we go - puzzle time. Did little Scott Inuoe go to kindergarten with zero in Hawaii? Did zero and Scott go to the same Menteng school in Indonesia? Is the adult Scott Inoue holding the photograph dated 1969 (signed by zero in the top right hand side)the same as the adult circled in the Indonesian image composite? And why would someone have added a 'fringe' to little Scott's hair in the image supposedly from Hawaii in 1969?