In a medium bowl, combine thawed peaches, tarragon leaves, and orange liqueur. Set aside to macerate.
In a medium mixing bowl, use a hand mixer to mix mascarpone cheese and sugar until creamy. Whisk in thawed whipped topping.
Divide half of the mascarpone cream among 6 parfait glasses or large martini glasses. Top with macerated peach and tarragon mixture. Sprinkle peaches with crushed biscotti and top with remaining mascarpone cream. Scatter almonds over and serve.
Recipe courtesy of Sandra Lee