The term 'Tiny Critter' can be summarized by two crossword solutions: MITE (4 letters) and AMEBA (5 letters). Mites are small arthropods that belong to the Acari family, and they are typically found in soil, plants, and water. Amebas are single-celled organisms that belong to the protozoa family, and they are found in aquatic environments. Both mites and amebas are microscopic creatures, making them perfect examples of tiny critters.