Hi!! I was wondering if you had any recommendations for corn snake morphs that are grey and yellow? The closest I’ve found is caramel but I’m not very well researched. Thank you so much!!
I'm sorry to tell you that this is a bit of a tough (but not impossible!) order, my friend, and I'll explain why:
Corn snakes have three main pigment types: melanin (black), erythrin (red/orange), and xanthin (yellow). Most of the known color morphs will affect one or more of these pigments but they tend to be interrelated, so masking or removing one will often affect the others to some degree, and xanthin seems to be the first to go in many cases.
Most morphs are going to reduce or eliminate melanin (Amel, Hypo, Lavender, etc.) and/or enhance erythrin (Strawberry, Lava, Sunkissed) so you're going to be hard-pressed to find a morph combo that retains melanin without washing to brown but also eliminates erythrin while maintaining xanthin.
The Anerythristic A morph (aka Anery) removes erythrin and masks xanthin. Grey snake, but no yellow. Some adults will get yellow in the neck area but it won't be full body.
The Caramel morph, which you've already found, enhances xanthin and reduces melanin and erythrin. Brown snake.
There are other morphs and a potential selectively-bred yellow enhancement that you might explore that could accomplish what you're hoping for, but you'll be at the whim of breeders who, quite frankly, aren't likely to be focusing on this particular color combo.
For possible morphs that might fit your aesthetic, you could look for high-yellow Caramels, selectively bred Miami or Okeetee Caramels, Caramel Kastanie, or a morph called Dark Yellow which is a combination of Scaleless, Caramel, and Anery. I've also heard of a yellow-enhancing trait called Yellow Coat but I've never seen it and I don't know if it was a fluke, a selectively-bred trait, or a genuine recessive gene that has just fallen off the radar due to lack of popularity.
I would advise to look at adult photos and disregard baby photos, as baby coloration almost never stays the same. You might find that a muddy brown or grey baby corn snake grows into a gorgeous yellow and dark grey adult.
I wish you the best of luck in your search and if you can't find exactly what you're looking for, perhaps you can work with a breeder to launch a project, or if you have the resources you can start one yourself!