My daughter broke the quick release hinge bolt (I have no idea what to call it) on her Mongoose scooter.
Where can I go to find a replacement part or at a minimum, what is it called?
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It looks like a quick release seatpost binder
You might have a bicycle with one on it you could use to test the fit.
Googling "bicycle seatpost quick release M6 × 65mm" gets results Here's one on ebay as an example (not a recommendation)
Or, you might be able to find a metric bolt with the correct thread down at the hardware store along with appropriate washers. Tighten it with a wrench rather than have a quick release lever as a temporary fix.