It's in one of the comics that comes with the action figures from the '90's. Honestly, it's a really ropy way to achieve the same result.
Genetic engineering in a lab would permit any hybrid just by implanting the DNA into the hugger without going to other worlds. You could easily posit a scenario where Scorpion, Gorilla and Crab Aliens are running amuck in a laboratory space craft where genetic experiments are being held. Maybe even aboard the Auriga, or a sister ship. Would make an interesting 'midquel' between 'ALIEN 3' and 'ALIEN: Resurrection'.
It's just a little, teensy-weensie bit more credible than finding giant scorpions on another planet. Well, that's my take on how to justify the Kenner range of 90's figures. DNA inserted into facehuggers. you could come up with any kind of Alien that way and still have human hosts for them to gestate inside.
-Windebieste