They do make, or at least have made $2 dollar bills. Most people don't like them and don't use them. If you follow the logic of coins you have pennies and and nickels and dime and quarters and dollar coins. You can make any combination of change with those coins. Same goes for $1, $5, $10, $20, $50, and $100. There really is no practical use for a $2 bill.
The 2, 3 or 4 dollar bills are not being made because the Department of Treasury declared the bills to be unpopular. However, the 2 dollar bill is often reissued according to the demand and you can request for it at a local bank. Visit http://en.wikipedia.org/wiki/United_States_two-dollar_bill for more details.