As revealed in The Toys That Made Us, most people did not expect Star Trek to last long. And so, to eke out as much filthy lucre as possible before audiences moved on, a company called Remco shipped out all sorts of hastily assembled crap with the sort of careless, greedy abandon that would do a Ferengi proud.
They basically slapped the Star Trek logo and pictures of Leonard Nimoy on toys they already had laying around the warehouse. You could even get Star Trek tanks and helicopters. The passage of time did little to decrease the peddling of shoddy merch. Seven years after the unexpectedly popular Star Trek was cancelled, shelves were still being stocked with the aforementioned Vulcan hockey crossing guard gear. In addition to the "flashing light emitter with pulsing sonic sound," a sheet of stickers was included, so lucky children could spell out the name of their favorite character. Which we're reasonably sure happened exactly zero times.