Want to work on your legato? Interested in portmanteaus? This exercise can help with both!
The key to a succesful portmanteaus is to sing them light, late, fast and diatonic, rather than chromatic. You don't want them to be a glissando or a slide- try to allow your air to spin and your vibrato to ring freely.
Most of all, have fun discovering and plying with your voice!