Probably technically an intersex condition, as this seems to be an individual born with external genitalia that are "female" in appearance but internally they have some sort of hormonal/genetic mix-up which causes them to have excess amounts of testosterone and thus develop a body shape and size that is more male-typical.
Technically being trans can't really be applied to the animal world, since animals don't have the same socially-imposed binary system of gender that we do, and therefore they lack the ability to "transition" from one to the other or "identify" as one or the other because they can't really conceptualize either social gender roles or body dysphoria, they simply are what they are, feeling what they're feeling. Like, how do we know whether these masculine "female" animals identify as "male" or not? How do we know they're a Buck Angel or Chaz Bono and not a K.D. Lang or a Brittney Griner / Caster Semenya? In the animal world, their behavior simply speaks for itself, and we're just taking their genital configuration at face value, we generally don't do chromosomal/gender testing on them, assuming that vagina=female and penis=male. So basically what would be "trans" to us would basically be indistinguishable from individuals who would be "butch" or intersex or even just tomboys in human culture. You can't really ask animals why they're acting in gender-atypical ways, and you really don't know what's causing body anomalies, even though it happens all the time, and for the exact same reasons why it happens in humans, which would include the trans* spectrum.
