Final answer:
Students seeing an image of a frog and saying 'frog' are in the one-word stage of word recognition where single-word utterances carry larger meanings.
Step-by-step explanation:
When students see an image of a frog and say frog, they are demonstrating the one-word stage of word recognition. At this stage, typically between 1 to 18 months old, children can identify familiar objects or events, often as single nouns. These one-word utterances carry larger meanings, which can include identification or requests, even though the child’s vocabulary is limited.