@stux pyrocumulus, pyrocumulonimbus...
aka "NASA’s name for these clouds is 'the fire-breathing dragon of clouds'. Not only do these clouds funnel smoke, but they also trap pollutants in the upper atmosphere."
https://www.dnaindia.com/world/report-watch-scary-fire-clouds-form-over-canada-in-stunning-video-pyrocumulonimbus-heatwave-wildfire-heat-dome-2898988