How do you say cockroach in spanish?

well the translation is 'cafard'.

(a)cockroach

(b)(Infml)coup de ~ fit of the blues; avoir le ~ to be feeling down, have the blues, be feeling gloomy; avoir un coup de ~ to be feeling (a bit) down in the dumps; donner le ~ à qn to get sb down, depress sb

(c)(Infml, pej)telltale, grass (Slang), sneak (less common)

(d)(old-fashioned)hypocrite