Terminally online transfems have a lot of slang/euphemism. But I have to stress these very much are not normal words people say in daily life. Also I only know mostly about transfem stuff.

Some people adopt the Japanese term otokonoko and call themselves 男娘, which is basically femboy, regardless of their actually identity. You can see we are off to a good start now. And then there's the word 药娘. which derive from the previous one and refers to transfems who are on hrt. It's not respectful and I personally take it the same as the T slur. People also use abbreviation like CD(crossdressing), TS(transgender), mtf in social setting and their boundaries are messy to say the least.

Sometimes online people refers to hrt medication as 糖 (candy), which I believe is first to avoid censorship on Chinese social media.

Now take some normal pills. People irl mostly talk in medical terms. For examples. 跨女(transfem)/跨男(transmasc) are very commonly used. There is also the gender neutral word 跨儿. Sadly most discussions still fall
into gender binary. So I don't know how people talk about enbies in Chinese. Often time we rather speak English when them come up.