See also: Androgyne
Androgyny is a wide category of gender expression that either mixes or omits markers of both feminine and masculine gender expression. This can include vocal androgyny, androgyny in clothing (such as genderfuck), and other forms of presentation and expression seen as androgynous. A person who looks androgynous may or may not intend to look so.
An androgynous gender expression is different than an androgynous gender identity. A person who looks androgynous, or who calls their gender expression androgynous, doesn't necessarily call their gender identity androgyne. People with a nonbinary gender identity don't necessarily have or want to have an androgynous gender expression. That said, the difference between an identity and an expression are not always clear. Some androgynous gender identities and expressions include androgyne, bigender, genderqueer, intergender, and yinyang ren, although this depends on the individual's definition.
A person who is transgender androgynous, also known as trans andro, is a nonbinary transgender person who is androgynous and also wishes to transition to their desired body type. Trans andro people may or may not experience gender dysphoria, and may or may not perceive their gender as separate or more specific to other similar nonbinary identities.
Trans androgynous people may or may not lean more toward a traditional masculine or feminine presentation as opposed to fully gender-neutral presentation. A trans andro person feels that their androgynous behaviour, personal identity, and/or presentation is a more specific identity from other nonbinary and transgender identities. Their pronouns vary per person, but typically a trans andro person rejects the pronouns given to them at birth in favour of other options.
The first appearance of the term "trans andro" appears to be from tumblr user "transandro" in 2012, though the term is naturally constructed. Since the term androgyne can be interpreted in different ways, identifying as trans androgynous is more specific and accurate for some people.