Green gooey stuff when removing head from raw shrimp When removing the head from a raw shrimp, I usually expect orangey goo to come out / be visible (the yummy stuff when you suck it of a prepared shrimp, I suppose :) ). I also usually have fresh shrimps. Today however I bought frozen ones, and some of them have green instead of an orangey goo.

The "green ones" all look fresh, and, IME usually more important, smell fresh (taking in to account the defrosted seafood nature of things).

Question is: Are they good to eat? Does this happen "naturally"?

The box in which they came didn't look like frosting-defrosting-re-(re-)frosting happened, and wasn't over the expiry date. 

Personally, I think it's due to the diet of the shrimps (I'm close to 100% certain that they're farmed, but I don't have the box anymore), and that it's the color of algae I'm seeing. While removing the digestive tract of the "green ones", they seemed to share the same uranium like hue of green. 

For posterity: 

Without waiting for an answer, and being the dare devil (and hungry guy) I am, I'm going to move diligently forward. For all those reading this: Should there not be an accepted answer, let it be known not to eat shrimps with green goo coming out when taking of the heads.
I think what you are seeing may be the hepatopancreas. From a Serious Eats article about shrimp heads:

There could be nothing sweeter and tastier than those shrimp heads. For in their armored shells you will find the hepatopancreas, the digestive organ that in lobsters and crabs would be called tomalley.
Shrimp hepatopancreas tastes like tomalley, only shrimpier, and more liquid-like.


This article on hepatopancreas condition states that the color of the hepatopancreas depends on diet:

Regarding shrimp roe (also called coral) and eggs, please see this excerpt about the shrimp life cycle and the picture below.

Eggs develop in the female prior to spawning, and can be seen as a dark band just under the shell on the head. Shortly after mating, eggs are extruded to the underside of the abdomen, where they are fertilized by a packet of sperm previously obtained from the male, then attached to the female's specialized legs. The female carries the developing eggs until they hatch in early spring. Newly hatched shrimp larvae are small (about 3/16 of an inch, or 5mm), planktonic (free floating, unable to swim against currents), and bear only a superficial resemblance to adults.


See this picture (EMS is Early Mortality Syndrome):