I came across the garlic routing section (8.1.1) in Roger's Master's thesis: https://dspace.mit.edu/bitstream/handle/1721.1/86475/46861930-MIT.pdf?sequence=2. I am not sure whether current Tor version is using garlic routing or just onion routing? Please correct me if I say anything wrong.
No, Tor does not use garlic routing as defined here.
A node then finds several garlic bulbs to transmit, instead of the normal single onion.
No. Currently, Tor is based on a strict (original) onion routing model, in which one stream can only be attached onto one and only one circuit.