Certainly, many animals eat lichens, including snails, voles, squirrels and snub-nosed monkeys. In winter, they are an important source of food for reindeer, which avoid the ones containing poisonous cyanobacteria. Humans sometimes eat lichens too, and some species are used in Asian traditional medicines.
Is Clover toxic to humans?
WARNING: White clover in colder climates is generally non-poisonous, but the same white clover in warmer climates can be poisonous. All clover with white flowers should be avoided except in the northern states and Canada. Clover can be eaten raw but it is safer to boil it first.
Can Moss be eaten by humans?
Most of us believe that moss and lichens are not edible. However, lichens make up a substantial part of the diet in the Arctic, and almost every moss and lichen is edible. That does not imply that they are palatable, or nutritious, but most can, indeed, be eaten. When desperate, eat!