Look at Cocozelle and Striata D'Italia if you want heirlooms. If a hybrid is acceptable, then Green Tiger.
They are all Bush varieties and the zucchini they produce are very similar -- nutty/sweet taste and thin skin. You just need to pick them when they are the size you want as all three will produce monster zucchini if left a few extra days.
All three, as well as Ronde De Nice, are available from Pinetree -
https://www.superseeds.com/collections/squash?page=1
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