This is an image of trophozoites in crenated RBCs from stored blood with anticoagulant. The red blood cells seem to have very ragged edges. You have to decide whether this smear is positive or negative, or if you can determine anything from the appearance of the red cells.
This smear is positive. Crenation has caused the cells to shrink, and the membrane has become folded and convoluted as volume has decreased.