Looks like you've got stink/leaf footed bug nymphs. Hit 'em hard asap with an insecticidal soap (twice a week until you see significant reduction in population), because they will be really difficult to deal with as adults.
Garden Safe brand is an inexpensive brand you can pick up at the box store. It can make plants photosensitive, so I'd suggest you spray the plants on a shady day (or at the crack of dawn), then rinse it off after a few minutes. It works on contact -- no benefit to leaving the residue on the plants.
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