πόδι means both "leg" and "foot". It doesn't differentiate between the two - it includes both. I believe it's the most commonly-used term to refer to either part of the body.

Here's my understanding of the other words:

• σκέλος does indeed mean leg (without the foot)
• κνήμη is shin, so is just a part of the leg
• πους is just the Katharevousa form of πόδι and therefore also includes the foot
• πρόποδες is more like a figurative use of foot, as in 'the foot of the mountain'

A native speaker might want to correct me though.

Aren't there (2) different words for "leg" (σκέλος; κνήμη) and "foot" (πους; πρόποδες) ?

Ψηλό = tall and should be accepted. Μακρύ = long.

(This didn't seem to post before, so if it repeats, sorry.)

Does this guy only have one long leg? I think we'd say, His legs are long. Or: One of his legs is longer than the other.

Εγώ έγραψα "His foot is long" και το πρόγραμμα απέρριψε την απάντησή μου...η λέχη "πόδι" σημαίναι "leg" και "foot" επίσης, σωστά;

I agree with greekdude ...

I think the problem is that in English this is an odd sentence. Who would say this?

His foot is long was marked wrong