A short-term mortgage in which small payments are made until the completion of the term, when the entire balance is due, is BALLOON MORTGAGE.
Balloon mortgage is a type of loan that needs to be paid in a lump sum or is repaid at the end of the loan period, in a single payment. Depending on the agreement between the borrower and the lender, this type of payment may be interest free. Interest may apply but is usually smaller than long-term loans.