Dead-looking tree sprouting suckers everywhere
Behind my fence in my neighbor's yard is a dead-looking tree. Nothing but brown crunchy leaves, trunk is maybe 20 ft tall. Near it are tall plants, pictured (upside-down for unknown reason). These "tall plants" are sprouting up randomly in my front lawn, up to 20 ft from the dead(?) tree. I'm curious what this tree (to be?) is.
Suckers have shiny leaves, serrated, redish tint.
Let me know if there's other info I should provide.