I also hear term girtwink for the first time but "twink" is not a boy who looks girly it is just young cute guy adult who looks like a boy nothing related to girls at all. Good example are those nazi germany propaganda movies.
Opposite of twink is "bear"

girltwink probably will be a girl who looks like a boy


tomboy is not very clear in what it means as it can be a girl who behaves like a boy but looks like girl so it will be a boy in girls body but in that case she can be way more feminine than normal girls. and look extremely feminine just not very tidy :) because that's what happens if you give a guy girls body.
thats a girls' of the dreams :)

or she can be some girl who is desperate to show herself as a boy by being overly aggressive and adopting masculine roles, obsession with sports and fighting without any need or benefit. Almost transgender man.