smoke-on-the-prairie vs snow-on-the-mountain

smoke-on-the-prairie

snow-on-the-mountain

noun

A small shrub in the family Euphorbiaceae, having white-margined leaves and white flowers; Euphorbia marginata.

How often have the words smoke-on-the-prairie and snow-on-the-mountain occurred in a corpus of books? (source: Google Ngram Viewer )