Actually there are more amphibians than straight floats because they can take off not only from water. Frequently gear and floats can both be attached to the plane, depending on which surface one flies.
Float planes, in contrary to flying boats can also take off on snow in winter. However, I also have a plane with skis. I even have a plane I can equip with gear, floates or skis. It's a Twin Otter with a wing span of 205cm (80").
Karl