Get yourself some Humboldt Seed Co "Mountain Top Mint". You'll need to hunt for a really minty one but you'll find it.
As a fellow spearmint lover, this is as close as I know to exist in cannabis, to actual spearmint terps, but like I said you gotta hunt for it a lil bit. Some will be funky almost skunky, some a bit fruity sweet, but you'll get that one and be like OHFUCK.