The element that rhymes with "keen" is "tin."
The word "keen" rhymes with mean and can also mean to scream loudly or shout enthusiastically.
sheen, lean, mean, bean, green, jean, keen, ween
Keen, Mean, Gleen
Keen is an adjective that rhymes with mean.
Keen.
Nickel is an element that rhymes with tickle.
queen, tween, keen, lean, clean,
The word "lean" fits your criteria as it means cool and rhymes with green.
Green is a color word that rhymes with bean.
Magazine aputine methamphetimenies Fiend Teen Keen Mean Seen
There are several words that rhyme with fean. Since rhymes depends on pronunciation, I am assuming here that fean rhymes with lean. Here are other rhymes: bean dean green jean keen lean mean preen queen seen scene sheen teen wean
nothing