Final answer:
Camden's error in saying 'two feet' instead of 'two feet' is an example of overregularization, a common mistake in early language development.
Step-by-step explanation:
Camden, a two-year-old who says, "I have two feet" when she finds only one of her shoes, is demonstrating overregularization. This term refers to a common error in language acquisition among young children, where they apply general grammatical rules to words that are exceptions. In Camden's case, she has overgeneralized the typical pluralization rule of adding an "s" by saying "foots" instead of the irregular plural form "feet". This shows an understanding of the general rule of creating plurals in English, even though she has not yet learned the specific irregularities that apply to certain words.