Artisan lettuce is a hybrid type of lttuce that contains three types of lettuce
Green Gem: is a hybrid, a member of the sunflower family with ‘very petite’ leaves.
Tango: has frilly edges, is a dark green color and is described as “tangy". It is.
Oak: this is the dark lettuce and adds an interesting color contrast to the traditional greens.
It also contains Vitamin A, numerous B vitamins, vitamin C, calcium, manganese, iron, potassium, copper, phosphorous. (source)
So can rabbits eat artisan lettuce?
They can a little bit of it. However, like most lettuces it contains a huge amount of water and will bloat a rabbit if too much is eaten.
So do take care with how much you give them as they will eat all of it if given the chance.