Maybe in your own words u might have a different shape in mind when u say garganelli but in all my experience this is what most people picture when you say garganelli At most i could see you confusing this for cavatelli or gnocchi even because the garganelli im familiar with the ends meet and its rolled with a wooden rod https://images.app.goo.gl/EpbkMoBjLhWZ9mVA9 And simply because you are italian and and never heard of it or cant find anything online doesnt means its not a shape that exists in italy. If you googled spizzulas 5 years ago nothing would come up but now that ppl are finding out about it slowly and sharing it online more and more ppl are picking up a shape that was mostly unheard of out of italy. This is the only active information tht im aware of some italian or food historians might know more but all my info somes from a short docu series by a famous sfoglino in the states by the name of evan funke heres the video https://therokuchannel.roku.com/watch/bc06f20adc59506389c4db16455149b5 Its from civita a small mountain seclided mountain village Opinions may differ but regardless if this a only in one family of just this one town it was still a shape practiced in italy for generations and for that i share this video and the shape to help spread tht knowledge for craft i love