In GT canon, are there 2 possible Super Saiyan 4 forms?

[Bacon Skittles]

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[Tectorman]

I think the closest we can find is what Baby tried to force Vegeta's body into becoming. He surpassed Goku 's initial SSJ3 and the tailed, power-corrected later version. One could argue that Baby had forcibly unlocked further transformations in Vegeta's body, taking him to and past SSJ3. Of course, once the Blutz waves hit, it becomes a non-issue, as Baby Vegeta is now progressing on the same "Super Oozaru" transformation track that Goku was on with SSJ4.

Not that I think we're supposed to take it that way.

[Herms]

So from what I understand Super Saiyan 3 was a forced transformation.

What's a "forced transformation" mean?

Anyway, within the series the "Super Saiyan 2/3/4" naming scheme is just something Goku and the other characters coin for convenience's sake. The boundaries between different forms is probably a lot more fluid than the view of things we've absorbed from countless video games. There's probably lots of variants you can play around with, and anything that could produce a new form stronger than the one Goku happened to label "Super Saiyan 3" could justifiably be called "Super Saiyan 4. Even in the GT series itself, it seems like the Elder Kaioshin doesn't actually have much of a clue what form Goku will take when he masters his dormant power, and is just ready to slap the "Super Saiyan 4" label on the first successful result.

[SSJ Human]

I'm guessing it's just a thing with the characters and that the terms come from convenience.

[Marlowe89]

I've always reasoned that the Golden Oozaru form was somewhat like a natural progression of Super Saiyan 3 considering that SS3 itself does kind of look like it's supposed to head in that direction from a design perspective. Given the fact that Super Saiyan 4 is basically the humanoid form of that, I sort of figured that was the reason for the name.

It's not much more than headcanon, really, but the explanation works for me.