[prairie dog]

What are those fat sausage-looking things on top of mid- fuselage?

[Charles Martel]

Those appear to be the main landing gear mounts and fairings.

[SES1066]

What are those fat sausage-looking things on top of mid- fuselage?

The old Soviets had some far ranging plans for this air/sea platform. The tubes you see were for anti-shipping missiles - see below'

Another mission role would have been as a troop carrier for VERY RAPID amphibious landings. At 300+mph, these could be from under horizon to beach in minutes!