I don't know what they call themselves but there are few Chinese guys that go to the garden center I get my mulch and supplies from. The come in little cars with 5 gallon pails and buy loam 3 bucks at a time. They go from door to door asking people if they can fix the bare spots on their lawns. Looks pretty funny to see them pull in the lot with their cars and fill up the buckets with loam. The owner said he keeps catching them filling their pockets with seed.