From IRS Publication 501:
"You can't claim a person as a dependent unless that person is a U.S. citizen, a U.S. resident alien, a U.S. national, or a resident of Canada or Mexico."
As F-1 visa holders and in the US for only three years, they are not US Resident Aliens yet.
You didn't say which country they are from. If they are not a "a U.S. national, or a resident of Canada or Mexico", no, they can not be claimed as dependents on your federal income tax return.
https://www.irs.gov/publications/p501#en_US_2024_publink1000196863
