Picture posting is enabled for all :)
Nothing is really like PFA except that French imposter La Ratte and the PFA cross (with a Desiree of all things) Anya.... Actually Congo are a bit, similar long thin knobbly tubers with loads of eyes but you don't get the wild (and entertaining) shapes and the d**n things are even later than PFA (wouldn't have believed it until I grew them)...
If you like Pink fir apple, you might be interested to see a cross between Pink fir apple and Solanum phureja. Mayan Gold also gets a mention, on this post:http://oca-testbed.blogspot.com/2010/10/whats-that-other-andean-tuber.html