Crayola has one of the few registered scent-based trademarks in Canada:
In Canada, a trademark can be anything that is used by by a seller to distinguish their goods or services from those of others. The law gives the following examples of things that could be trademarks, and it's not even an exhaustive list!
Theoretically there could be some hilariously specific trademarks out there — if only someone would think to litigate over them.
Crayon Scent Mark. Canadian Trademarks Database 1986544. Crayola (2019). ↩︎
Trademarks Act. RSC 1985, c T-13. Canada (2021). ↩︎