kidspot:1) 3) Turtles are "similar" to jets, but not clones like the rockets would be considered (though even they are different) You can see the difference between Turtles and Jets here: http://www.kidspot.org/personal/scubaboard/fincomparison.html - Turtles are 1/8" wider and about 1" shorter, with a softer, more flexible feel to them and only come in one size (approx 12-14) fortunately they are a size between the XL and XXL Jet fins. Also the foot pocket is more flexible and much more likely to conform to your foot. The pair I have are made by IDI - Someone can correct me, but I think they were recently sold to a new manufacturer.
Turtles are now produced by XS Scuba (http://www.xsscuba.com/fins.php). I bought a pair of the XS Scuba Turtles recently and I found they are very "mushy" in the foot pocket. Way to flexible for my liking; I did one dive and gave them to a friend.
I had bought them because they are so bloody wide and I have wide feet, but they were too wide for my feet (ordered without trying them on as I live in China). I've now bought a new pair of Jets and will live with them being a bit tight.
Drew