Plant hoppers refer to a group of insects that are typically pests in agriculture. If you're looking for synonyms for the word "plant hopper," there are several terms that might fit the bill. For example, "leafhopper" is a common term used to refer to these insects, as they often feed on the sap of leaves. Some types of plant hoppers are also known as "treehoppers," especially those that infest fruit trees. Other possible synonyms might include terms like "pest hopper" or "crop hopper," which emphasize the negative impact that these insects can have on plants and crops. Ultimately, the specific synonym you choose will depend on the context and purpose of your writing.