I rushed a big frozen grin onto my face.
The face was bloated, its lips spread in a frozen grin.
A frozen grin was rising on his fat round face.
You may see men on the street any day whose laugh is only a frozen grin with nothing in it but teeth.
His lips were drawn back in a frozen grin.
The dwarf's frozen grin did not change, but his eyes were eloquent.
A brief pause, then his mouth twisted in a frozen grin.
His lips were drawn back from his teeth in a frozen grin of agony.
The man's' teeth clicked shut, hidden behind that frozen grin.
He looked at the Archchancellor's frozen grin and sighed.