"Swashbuckle Sloop" is not an official name yet. It may have been referenced in the storyline as such, but has not been officially named. Alternatively, it may be a name popular among fans, but has no official basis.
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The Swashbuckle Sloop is made of dark brown wood with golden trimming. it has a similar-looking interior. It has two large masts, each with a black sail. The front sail depicts a gold treasure chest and crossbones; the same symbol seen on Sid Swashbuckle's hat. It has a cargo hold where Sid stashes the various objects he and Arrby have stolen.
When turned into a submarine, it gains a driver's seat and electronic map.
The Swashbuckle Sloop is the second vehicle used by a villain to have an alternate mode, the first being Sweetie's Mission PAW roadster/flying helicopter car, though its size is much larger and it is more of a mobile base befitting a modern day pirates like Sid & Arrby (as its ability to change into a submarine allows Sid to plunder borh above and below the waves).
It is similar to the Kitten Catastrophe Crew's Kitty Carrier Mobile in that it is a vehicle used by both a human villain (Mayor Humdinger & Sid Swashbuckle) and their animal henchmen (KCC & Arrby).
Though its ability to turn into a sub is impressive, it is shown to lack the ability to go onto land like the Sea Patroller in "Sea Patrol: Pups Save Their Pirated Sea Patroller" which leads Sid & Arrby to try and steal the Sea Patroller. Sid has no problem abandoning his ship, which leaves him and Arrby to search for their ship after the Sea Patrol reclaims the Sea Patroller.
Ironically, Sea Patroller lacks the ability to turn into sub though fortunately the Sea Patrol has the Sub Patroller to make up for this, which Sid & Arrby ironically failed to steal along with the Sea Patroller. Thus the Swashbuckle Sloop can be seen as a counterpart to the Sea Patroller with each ship having an alternate mode the other lacks.