So... i'm new here, and my english is very poor, sorry for anything. :(
I love DPPT Metagame.
I'm not a expert of Pokémon, and i don't think i'm a good player, but can I try to help you?
With Froslass in BL, Nidoking is the most used lead, i guess. In my opinnion, you can change this spot to...