Easy question! Although we are guys indeed, we are unfortunately female by biological nature. A female homosexual is a lesbian, so if you are a transguy who is only interested in other females, be it cis women, afab enbies, other transguys, or the like- they are (and so are we, the mods here) by definition lesbians. A lot of transguys will also label themselves transhet and thats completely valid, labels are up to the owner of said labels.
Anyway, lesbian transmen have actually been a very large part of lgbt history in the past- being much more commonly seen in the forefront of our fight for equality than they are today. We strive to bring our boys back into the light and show everyone just how strong and amazing a lesbian man can be ✊🏼✊🏼