Hydrochloric acid is found in a humans stomach. Usually it is called Gastric Acid.
Lactic acid builds up in the muscles. It is a waste product of anaerobic glycolysis (The production of ATP without oxygen).
Formic Acid is called "methanoic acid" in systematic terms. It has other names too such as fomic acid, aminic acid and hydrogen carbolyxic acid. It is the simplest form of carbolyxic acid. Its molecular formula is HCOOH. Formic acid is mainly found in natural surroundings, especially in the bites and stings of bees, ants and other insects of the order of hymenoptera. It is derived from the Latin word "Formica" meaning ant which refers to it early isolation by the refinement of insect bodies. Its molecular shape is planar. Its solubility in water is miscible.
Citric acid is the acid found in citrus fruits
Tartaric acid is found in many plants, e.g., grapes; this natural acid is chiefly the dextrorotatory d-tartaric acid, called also d-2,3-dihydroxysuccinic acid or l-2,3-dihydroxybutanedioic acid. This form can be partially converted to the others by heating it with an aqueous alkali, e.g., potassium hydroxide.
Tartaric acids can be synthesized from maleic acids or fumaric acids by reaction with aqueous potassium permanganate.