tussuck

/ˈtʌsək/
noun
  1. A small mound or clump of grass or sedge, often found in marshy or boggy ground.
    • The hiker stepped carefully over a tussuck of grass to avoid getting his feet wet.
    • The farmer's boots squelched as he walked between the tussucks in the boggy field.
    • In the meadow, each tussuck stood out like a small green island in the damp soil.