The only lvl 55 dragons are Vox and Nagafen who are both level restricted. So short of exploiting, no.
There were end game characters soloing Kunark era dragons as far back at least as PoP so I'm sure there's a kajillion characters out there now who can solo Gorenaire, Talendor and the rest of the Kunark gang (not to mention Velious era dragons).
I talked to a person once who swears a super twinked lvl 52 necro was able to solo nagafin, but I just don't believe that. He claimed there was a video floating around the internet that even showed him doing it, but I figured assumeing it exists it is just somebody on the everquest emulator having some fun. Only other way is if they was somehow cheating or found a exploit.
There was a 51 (52? whatever the limit is) monk who soloed Naggy using various shaman potions before they were nerfed. Now sure about Vox though I assume her healing would make her hearder to solo than Nagafen.
there is another dragon level 55 that anyone can go after is name is fadayer or somthing he is more of a fish kinda but i think he is classed as a dragon he is for druid epic and i have do a turn in to make him spawn and i think a level 70 could solo him
I don't have logs from that fight ~ I deleted all my luclin logs a while ago. I used two more boxes to handle the linked guards, but all of vindis damage/healing was done by one, tehlar. I would suspect that armew or one of the other beasts has done it, you might find a set of logs asking on TBD