Marzipan in king cakes

This was a thought I actually had last year during King Cake season but just remembered.

I always liked plain Randazzo’s and similar king cakes (like Antoine’s). To me they are just simple and delicious. I noticed there is a common flavor to one’s of that style that I really liked. Then I started eating almond croissants from a fancy bakery and it had a similar flavor, without the cinnamon obviously. I think it’s marzipan. I don’t really bake much and haven’t used marzipan myself. Anyone know if this is something that is commonly put in King Cakes or am I just making things up in my head?