Line a 9-inch springform pan with plastic wrap, leaving overhang for easy removal. Set aside.
If using pound cake, slice it horizontally into 2 even layers. Place one layer in the bottom of the pan (trim to fit). If using crumbs, mix shortcake crumbs with melted butter and press into bottom.
In a bowl, toss sliced strawberries with sugar. Let sit 10 minutes to release juices.
Spread half the softened vanilla ice cream evenly over the cake base using a spatula.
Spoon half the macerated strawberries (with juice) over the ice cream. Spread evenly.
Add remaining ice cream, then top with remaining strawberries. Place second pound cake layer on top (or more crumbs if using).
Cover with plastic wrap and freeze 6 hours or overnight until firm.
Remove from pan using plastic wrap overhang. Spread whipped topping over top. Garnish with fresh strawberry slices. Slice with a sharp knife dipped in hot water for clean cuts.