You can unlock the Frosty Boss trophy in The Grand Tour Game during Season 3 > Episode 5 > Scene 3.
Go for the trophy on lap two or three, as you'll be travelling much faster than the rolling start you get on lap one. To get a lap time of under 25 seconds, make sure you keep the lap clean, avoiding leaving the track so that that thicker snow at the side slows you down, and try to keep your cornering tight to the inside. Use the Square button on slower corners to drift around them smoothly.