• base, freebase, baseball, homer (all your BASE are belong to us)
• C, big C
• blow
• Bolivian marching powder
• Booger Sugar (suggested by Buck Clayton)
• coke
• crack, cat's pee
• dusty roads (when mixed with PCP)
• Florida snow (lookalike drug)
• lady caine
• line (one dose)
• Merck (manufacturer of pharmaceutical cocaine)
• Nose candy, candy cane
• Peruvian
• schoolboy
• scorpion
• snort
• snow (of course)
• speedball (when mixed with Heroin®)
• wacky dust
• weasel dust

There are a few more back at drug slang.

We may have more words for snow than the Eskimos have.