Scow, flat, barge, raft... you'd need to be more specific.
Another name for a tippy boat is, CANOE
The another name for canal boat is BARGE
Lagoon
flat bottom boats maybe?
A pontoon boat would be a light boat that is shallow to take in the water. Of course you could also get an inflatable boat, and that would work just as well.
laxmi
what is the name of the pleasure boat that collided in the river themes?
The best boat for shallow water is a shallow water boat. Gator trax boats (gatortraxboats.com) has a wide selection of shallow water boats.
by boat
laxmiEstuariesLagoonshoalPondLook
Towboat, river boat, tug, fleet boat
Beam...the widest part of a boat