Answer: Horticulturally speaking, the pointy projections on the trunks of Chorisia are spines. Since spines are really modified leaves, it's possible they would fall off naturally as they age. You can expect that the spines are firmly attached, and breaking them off might injure the trunk, providing an entrance for insects or disease pathogens. If you're willing to take that chance, you can probably remove them one at a time with pliers.
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