Carl is, as usual(!), completely correct: there is no morphing option available within MEP or VPX.
However, I have a program "Morpheus Photo Animation Suite" which, in its Professional version, allows the creation of such morphs, which can be exported as .avi and hence "edited/joined/whatever" in MEP/VPX.
Can't remember how much that program costs (edit: just checked, it's now $119.95(!!!); I'm sure I only paid about £40 when i bought my copy, admittedly several years ago, and that price has included several free updates, including the latest which I've just downloaded today!)
"Carl is, as usual(!), completely correct: there is no morphing option available within MEP or VPX."
Modesty prevents me from accepting such an allocade -- even though I was about to post such a reply when I realized the late local time. I am however thrilled at the acknowledgment of my psychic powers!
What I was going to say in addition to pity no MEP/VPX native option was that, following the '...best tool for the job...' line in recent posts, I have also selected a third party morphing program: