
We are at the edge of pumpkin and pumpkin spice season, with the peak still ahead of us, so I thought it would be fun to run three pumpkin terms through the Ngrams Viewer from Google Books: pumpkin pie, pumpkin pie spice, and pumpkin spice. For those not familiar with the tool, The Ngrams Viewer tool searches the Google Books library of digitized printed materials, which is mostly books but also includes periodicals, for the terms you request (with numerous variations allowed, as explained in the documentation).
Pumpkin Pie, Pie Spice, and Spice
Here is the Ngram chart for the three terms (link) from 1800 to 2019:
Not surprisingly, pumpkin pie spice and pumpkin spice do not appear until the mid-to-late 20th century. Pumpkin pie spice was probably created by one of the big spice houses (like McCormick), while pumpkin spice is a much more recent creation of the food and drink industry.