Tapio's old etiquette of the woods, courtesy owed to the forest's unseen owner on pain of the hunt failing, left a specific trace in the Finnish language that outlived the belief system that produced it. Collected folk charms addressed to Tapio describe an offended forest as capable of metsan peitto, literally the forest's cover or the forest's concealment, a state in which a person, an animal, or lost livestock could become invisible or hopelessly disoriented within what should have been familiar woodland, unable to find the way out until the forest's anger was somehow appeased, a belief serious enough that specific counter-charms were recorded for releasing someone believed to be caught in this condition. The phrase survives today in ordinary spoken Finnish as a way of describing someone or something that has become lost or gone missing without explanation, used by speakers with no particular belief in forest spirits, in much the way English speakers might say something has vanished into thin air without invoking any literal spirit of the air.
The linguistic survival is a smaller, quieter counterpart to the deliberate civic naming decision behind the garden suburb of Tapiola discussed elsewhere: where Tapiola was a conscious twentieth century choice to invoke the forest god's calm for a planning project, metsan peitto is an older phrase that drifted into ordinary usage on its own, carrying the shape of Tapio's old etiquette, offend the forest and it will hide things from you, forward into modern colloquial speech long after most speakers had stopped consciously connecting the idiom to any particular god.