A few weeks ago - not really sure how long - I summoned an Iced Sea Dragon from the Tree of Life, hatched it and thought I placed it in a Kindergarden.

I just tried to find it and even using the Dragon Book search feature it can't be found.
The Dragon Book shows that I have it. Least ways it is colored rather than greyed out.
BUT when I click on it in the Dragon Book it does not have the FIND or SELL button.

Does that mean I accidentally sold it at some point???

@TeamTerrier If there is no sell or search button in the book it is no longer on your islands. Seems as if you sold it.

@Bettina-Löffler That's what I was afraid of. Guess I have to hope I can collect enough orbs to get another one. First time I've mess up and done that.

@TeamTerrier You could ask the support for help. Sometimes they give back a dragon that was sold by mistake. How to contact them is in my signature line. Good luck.

what they said, looks like its been sold