I fear the Zygons are beyond my skills, but using The Freak (both the original and F4), I was able to fashion that hopefully looks something like the infamous "Mr. Potato Head of Outer Space". (The F4 version is to the viewer's left and the original Freak to the viewer's right.)

Sincerely,

Bill

Tempt the Hand of Fate and it'll give you the "finger"!