Typical soup cans, soda cans.
Garbage bins with metal lids
Anything with a flat, circular top and bottom with a rounded face between those.
The roof of a house,
There are no ordinary household objects shaped like a decagon. Some glasses or vases may be decagonal in shape.
There are few household objects that are shaped like nonagons. Some coins in a few countries are, but even these are rare designs.
Food shaped like a polygon
The items around the house that are shaped like a pentagon will vary depending on what is in your house. Some common examples are table lamp bases, some wristwatches, the pattern on a soccer ball, the tops of keys, etc.
The roof of a house,
some kaleidoscopes
A tent.
class
Some roleplaying game die and puzzles such as the Rubik's Cube are shaped like tetrahedrons.
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There are so many things which are shaped like a pyramid. Some of these things include the Pyramid Island in Nevada, earrings, cakes, hopscotch, chandeliers and so much more.
A folded napkin is often folded into a right triangle. The corners of walls can be shaped like a right angle.
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There are some Christmas gift stands that are shaped like rectangular pyramids.
An example of a dodecagon would be a semiregular tiling.There are many but some have dodecagons.
A rubick's cube, an icecube, dice, baby block, some boxes, 2x2 Lego pieces