Chestnut with a capital C **for John and Luke only**

Winter roads are often quite 1X
You can ride on une 5Xclette
2X Baker can be rather feisty
6x was an autobotette
Math was once taught by Mr. 4X
This'll be a nice j3X riddle to get

"Mes petits lutins, venez 7X!"
There's one key thing you musn't forget
Before each of you screams, "_ _ _ _ _ _ _TT_!"
Replace with letters from the alphabet