While browsing through a mail order catalog for small, precision tools, I ran across a listing for a "gourd saw." It appears to be a handheld stiff-bladed jigsaw. The seller describes it as one used by gourd artists for cutting into gourds.
Such specialized tools can often have multiple uses. The chop saw that I use for cutting stained glass zinc came is sometimes called an "arrow saw" because it's frequently used by people who make their own arrows.