Which two faces have been on the front of a US 2 dollar bill?

Actually, many more than 2 individuals have appeared on US $2 bills:

1862: Alexander Hamilton

1869: Thomas Jefferson

1886: General Winfield Scott Hancock

1891: Treasury Secretary William Windom

1896: Inventors and industrialists Samuel Morse and Robert Fulton

1899: George Washington

1918-present: Thomas Jefferson