Seems like more of a care package than a toy drive.

It's a little hard to figure how many exactly, but according to this graphic, 1.5% of high school students identify as trans, which is over 800 students.*

It also points out that:

• 71% are depressed, and 54% are suicidal. The numbers for cis kids is 26% and 14% respectively.
• 25% have dated someone who physically hurt them on purpose, 25% were forced to have sexual contact. 8% and 4% for cis kids.
• 49% have experienced violence, or the threat of violence so badly that they want to leave home. 20% cis.
• They're the least likely to feel supported by their parents and the community
• They're more likely to abuse prescription drugs, drink alcohol, and smoke.

Life is fucking hard if you're a trans teen.

*As a side note I'm pretty sure this number comes from a percentage of kids enrolled in public schools, so the number is likely slightly higher when accounting for private and home schooled.

This data is also from 2017, so numbers are probably somewhat different now.