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The 5th level Corpsefolk feat allows anyone to become large and increases your reach by 5 feet with no drawback unlike every similar feat of a higher level.* There might also be a level 1 ancestry specific feat the player took via the Gap-Touched Heritage's Novel Mutation Lineage feat. Homebrewed Core is a Xenometric Android lineage that can also allow you to make any medium ancestry large. An Astrazoan might be able to turn into a large orc, and if they're an assimilated Astrazoan they could probably pass as one.
*I'm still annoyed how many broken things Guilt of the Graveworld had in it.