Spawn command for certain items don't work.

I tried spawning in oshrooms to line the ocean floor near a settlement, as they are too thinned out to light the area well now. (stray attacks get annoying as it smashes them all....) But I checked the spawn name for the items, and every one of them spawns in perfectly generic items, and I made sure there was no typos. I wonder how many other items are affected by this. Also trying to find a way to spawn in decorative coral but could find no info about them.