Ground frost or hoar frost.
There was frost on the ground
Air frost - or ground frost
If you mean frost in the ground then it's routa in Finnish.
No.
frost
Frost is a form of deposition and requires a surface (on the ground) to form its ice crystals. Snow can only form in clouds - the ice crystals grow around condensation nuclei and then fall to the ground. Frost is confined to the ground.
The frost depth refers to how deeply frost can penetrate into the ground. In Martinsville, Virginia, the frost depth is around 18 inches deep.
Frost
Try GROUND FROST
No, frost will kill the leaves above ground, but the rhubarb plant is perennial & will return the following spring.
A puddle on the ground and an overheating engine.