Thorn Shrooms are one of the three mushroom enemies in Papa Louie 2: When Burgers Attack!
They are colored deep blue (much like Dark Blue frosting in Cupcakeria) and white with scrambled patterns all over. They are larger than blue shrooms, and, in thought, attack the same way. They have spikes all over their head, so you can't step on them without losing one of your hearts.
Thorn Shrooms are large, prickly Shrooms that grow abundantly in the muggy marshes of the Saucelands. They have evolved a menacing cap of sharp, blue thorns to ward off any annoying creature from jumping on their heads. Being firmly planted in BBQ sauce, Thorn Shrooms prefer growing in large groups. This can be rather problematic for passers by, as a large briar of Thorn Shrooms can easily block an unkempt path.