Abstract: Deformable foam toys and puzzles. Novel resilient foam puzzles can be removed from puzzle form and converted into a three dimensional objects, such as toy foam animals. The objects preferably include interchangeable parts, and more preferably include articulating appendages which are interchangeably attachable to a body portion at pivot structures that are affixed to, or which extend thru, the body portions. Preferably, pivot structures are formed by resilient foam pivot pins having deformable retaining caps at opposing ends thereof, which, in the case of foam animals, serve to retain articulating limbs. Alternately, a hex-shaped socket aperture defined by a wall edge portion is provided as a joint socket in one or more of the limbs, and a parallepiped, and preferably an elongated rectangular shoulder pin or hip pin is provided for displaceable frictional engagement with the hex shaped socket to articulate the limbs to desired positions.