Learned about termite insect droppings guide (idrinkandibreakthings.com) recently and geez, those tiny termite feces really do look like coffee grounds when you spot them near your baseboards!
My neighbor thought they had sawdust but turns out those oval-shaped termite pellets were signs of a active termite problem - definitely contacted professional help after finding fresh termite frass in the crawlspace because termite damage repair costs can get costly quickly!