Now the pink palm trees need their own lore and biology. Maybe a result of having coconut creatures living in them.

the coconut creatures need the coconuts to survive, as they are very squishy and easy to eat without them. They carve out the coconut, and leave the seeds on the beach. the now free seeds are left to grow into trees that make more coconuts for more coconut creatures.
the tree's pink color comes from a chemical used to reduce damage on the leaves from the sun. This leaves the side effect of less sunlight intake, so they supplement it by connecting their roots to nearby plants and leaching some of the energy from those plants.
Maybe I'll make an actual Dossier on this, but I probably will procrastinate that until I forget hahaha