I've only ever found 2 or 3 pumpkins togeather, today I started a new save, climbed a mountain, and saw a large orange cluster. Upon approaching I realized that is was 16 pumpkins, no less than 1 block apart. Was I just getting small amounts before or is this the motherload?
Here's the pic, I was in some kind of plains biome, I spawned down in a nice little 30x30 valley. (not exactly that big, trying to indicate size), I climbed up, I was facing an ocean on one side, and a plain in the other direction above me. I saw a weird large orange cluster, not knowing what it was I investigated, and found these. Anyway, I guess it's semi-normal, if rare.