Collard greens and Dandelion greens are basically the only greens my dragons like.
They tolerate bok choy. They get it occasionally as it's my Uro's favorite.
Mine has eaten a bite or two of collard greens, but loves butternut squash. has eaten a few green beans, but will chomp up the squash So I guess no greens that he enjoys. But squash is a staple too and he loves it (for being 7 and never having a veg before, that is pretty awesome!)
Mines same as Brandons. She pretty much only likes dandelion greens and collard greens. She used to like mustard greens too but now she will just tolerate it.
Dandelion but really doesn't like any of them unless he is hungry and it's the only food available. Letting some kohlrabi in the garden stay out for greens. Sick of paying money for things he won't eat. He has eaten collard, mustard, kale, and pretty much any turnip green.