One of the Brochymena genus Rough Stink Bugs. I think this may be an instar of B. quadripustulata, since it has the four spots or bumps, but the shield pattern isn’t quite like an adult’s (yet). These stink bugs are cryptically colored to blend in with bark, but they really stick out on a leaf. A true bug, meaning they are suckers, living on sap of a range of tree and shrubs. But also preying on other insect larvae and pupae, so some species are considered gardener-friendly, a natural defense.
Plus, if you smoosh ‘em, you’re gonna regret it.