Yes, spring onions can be considered herbs.
Spring onions, also known as green onions or scallions, are often classified as herbs due to their use as flavoring agents in various culinary applications. Like other herbs, they are typically used in smaller quantities to add aroma and flavor to dishes rather than being consumed as the main vegetable component. They share characteristics with other plants commonly categorized as herbs. Spring onions thrive in groups, similar to how many herbs are cultivated. They also have distinct aromatic properties, which is a common characteristic of herbs.
While sometimes categorized as vegetables, their common usage aligns more with that of an herb.