This is damage from the frost/freeze that much of Maryland experienced last week. Hardy plants do not retain their freeze tolerance once they have broken dormancy and begun to produce new growth, which is why temperature swings between very mild days and cold snaps in spring can be very damaging. We've received many inquiries about such damage on a variety of tree, shrub, and perennial species that had begun to grow or leaf-out when the we had a freeze overnight. Japanese Maples as a group were hit hard by that event, though as you noticed, damage can be hit-or-miss depending on a wide variety of factors that played into how vulnerable each individual tree was to the cold.

Nothing can heal the injured tissues, but healthy and well-established plants usually have enough energy reserves to produce new growth (if needed), though it may take them a few weeks to start to look normal again in that case. It would be best to wait to see how the plant fares, and only trim branch tips (when reachable) if they remain bare (having no new growth; that will probably not be the case here) once the rest of the tree leafs-out again. The wilted/singed leaves may eventually fall off on their own as they dry out, but more minimal damage (like what your pictures are showing) may not result in drastic leaf drop.

We are still in a worsening drought, carried over from the past two years of insufficient rain. It would reduce plant stress to monitor them for watering needs and irrigate them periodically as needed. The linked page has watering guidance. Producing new growth requires ample root moisture, and the process can be hindered or stalled if a plant is too drought-stressed.

Miri