I was searching on Google if any text used form चुचोर, and it pointed me to this page of the digitized copy of the book Tiṅntārṇavataraṇi:

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The form on this page is actually चुक्षोर, but obviously the OCR didn't or couldn't distinguish between चुचोर and चुक्षोर.  But I was amazed to see how far their OCR abilities have moved.  Best,

Madhav M. Deshpande
Professor Emeritus, Sanskrit and Linguistics
University of Michigan, Ann Arbor, Michigan, USA
Senior Fellow, Oxford Center for Hindu Studies

[Residence: Campbell, California, USA]