Does Chakotay have tattoos anywhere else on his body?
Why was he called The Tattooed Terror at the academy, if not. (Tsunkatse)
He wouldn't have had the face tattoo then. (Tattoo)
In the Blu-Ray releases, do they show Chakotay top-naked and with other tattoos?
I have solved your query.
Firstly, he doesn't have any notable tattoos from the chest up. He grew up on a colony on the Cardassian border. He went on a trip to Earth with his old man as a young teen. Shortly after returning, he left the colony and was accepted into SF(at 15 or 16 years old.) His Dad died at some point around this time. He got the tattoo sometime after his dad died. He returned to his colony sometime after his Dad died also.
Here's the important part. In Tsunkatse, they never say that Chakotay boxed at the academy, OR that he had this nickname as a boxer. He could have had this nickname while in the Maquis, and B'elanna is familiar with it. Or it's also possible she made up the nickname right there as part of her teasing of Kim.
Here's the conversation:
PARIS: You should trust him, Harry. Chakotay knows a thing or two about southpaws.
TORRES: He was twenty three and oh as a light heavyweight.
CHAKOTAY: Twenty three and and one, actually. A Nausicaan with a mean right hook.
KIM: You think that's bad? Try taking a parrises mallet to the ribs.
CHAKOTAY: I didn't know you played.
KIM: Three time Academy champion. Now, that's a tough sport.
CHAKOTAY: I boxed a few parrises players in my day.
TORRES: And?
CHAKOTAY: Let's just say they went back to playing parrises squares after that.
KIM: Oh, was that a challenge, Commander?
CHAKOTAY: I wouldn't want to put my Ops officer out of commission, now, would I?
KIM: I can take a punch.
TORRES:
Careful, Harry. Legend has it that the tattooed terror has put more men in Sickbay than the Ankaran flu.
PARIS: Yeah, you wouldn't want to bruise your clarinet fingers.
Now, I know that in a later episode, he is shown boxing with Boothby as his coach, but there's nothing in this conversation is connecting Chakotay-->Academy-->boxing-->Academy nickname.