u/Fabulous-Golf1387

Does this look like termite frass? Looking up pictures of frass I cannot confidently say whether it is or not.

I have not seen any termites or other signs, and this corner is frequently occupied with house spiders. The wood floor is not buckling, but tapping on the floor I can tell one spot to the left of the pile in front of the window that sounds different. The floor directly around the pile feels fine and sounds fine when tapping. The border around the window is not wood, but some kind of hard plastic.

Located in central Minnesota, USA.