Animals that eat meat are carnivores, animals that eat plants are herbivores, animals that will eat anything are called omnivores. But what are animals that absorb 25% of their nutrition directly from water called? The rest of its nutrition is absorbed from eating plants.
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You could call it a saprotroph.
As matter decomposes within a medium in which a saprotroph is residing, the saprotroph breaks such matter down into its composites. Proteins are broken down into their amino acid composites through the breaking of peptide bonds by proteases. Lipids are broken down into fatty acids and glycerol by lipases. Starch is broken down into pieces of simple disaccharides by amylases. These products are re-absorbed into the hypha through the cell wall via endocytosis and passed on throughout the mycelium complex. This facilitates the passage of such materials throughout the organism and allows for growth and, if necessary, repair.
Sapro implies decay but that is too narrow for this method of feeding. Decay might be occurring because of other organisms in the neighborhood. Or the decay might be facilitated by the organism itself. Or it is not necessary that absorbed materials be decayed - invasive fungal infections absorb nutrients from the live fluids of their hosts, and the invasive fungi are still saprophytes.
A few suggestions:
Dermis = skin, phage = eat, and stomata = mouth. So that would roughly translate to "skin eater", "skin mouth" and "mouth of skin". I don't think gastroderm would be entirely appropriate since the skin is only used for ingestion of food, not necessarily the dissolving of it.
Mind you, it eats a lot of plants, so it might be a herbivore. It's not the percentage that matters, but the adaptations. Is it better adapted for eating plants or absorbing nutrients through the skin? For example, an animal can still be a (hypo)carnivore if it eats only 30% meat and 70% other, provided it has the adaptations of a carnivore.
I usually call that a sponge; they are a type of sessile metazoan.
You could call them aquavores, but that seems to already refer to a fad diet.
I think Willk and Jackom5 are on spot. I propose an alternative, "dermotroph".
Autotrophs are animals that synthetize their own food. Heterotrophs take their food from the environment. "Troph" here means eat. So an animal that eats through the skin would be a "dermotroph".