Mariethe House,
Quirk et al, (2010), Page 1583, use the rather boring word, "Blend".
They give numerous examples of blends which are in popular use:
"smog" (smoke + fog)
"paratroops" (parachute + troops)
"heliport" (helicopter + airport)
"cheeseburger" (cheese + hamburger)
"stagflation" (stagnation + inflation)
"breathalyser" (breath + analyser)
etc.
Some blends did not become popular:
"swimsation" (swimsuit + sensation)
"lubritection" (lubricant + protection)
etc.
David Crystal, (2008), page 57, also defines, "Blending", giving examples:
"brunch" (breakfast + lunch)
"Interpol" (international + police)
"Eurovision" (Europe + television)
Les