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Note for the curious: WIMP simply means "weakly interactive massive particle". And "massive" here means "has mass," not that they're gigantic.

Although they're theorized to have a mass closer to the Higgs boson than a proton, which is a lot of mass as far as subatomic particles go.

As opposed to MACHOs ("massive compact halo object") where the "massive" actually does mean "planetary to stellar mass".

is that synonymous with dark matter as described in galaxy structure models?

IANAP, but they're (among others, like MACHOs, primordial BHs, etc.) potential candidates for dark matter, yes.