I would let them dry out as you normally would. If they survive the process, then freezing them will either kill them or make them dormant. Either way, the little critters will be dead when boiled. But most likely dead well before that. I take the same approach with spider mites.
"Look, let me explain something to you. I'm not Mr. Lebowski. You're Mr. Lebowski. I'm the Dude. So that's what you call me. That or His Dudeness... Duder... or El Duderino, if, you know, you're not into the whole brevity thing." -The Dude