The fusion360 file is given would you like to see how I did it, to modify it , …, or if you simply want to adjust the tolerances to your needs for example.
The stem act like a wedge, when hung the pumpkin is held together by gravity. However, it should hold as is as well due to a snug fit. Depending on how you want to display your pumpkin there is a model with and without hole in the stem.
Printing info:
The author remixed this model.
Made a 2 color versions of the base model