To evaluate the expression \( fg + h \) for \( f = -5 \), \( g = -4 \), and \( h = 6 \), we first calculate the product \( fg \).
\[ fg = (-5)(-4) = 20 \]
Next, we add \( h \) to the product:
\[ fg + h = 20 + 6 = 26 \]
Thus, the final result is:
\[ \boxed{26} \]