50's to 60s Vintage Plastic DUCK Dog Fish Toy Rattles Bear Bottle Knickerbocker?

Description

50's to 60s Vintage Plastic DUCK Dog Fish Toy Rattles Bear Bottle Knickerbocker?. These were in the home my daughter and Son in Law purchased, and everything else there (including comics from the late 50's) would suggest a similar age for these toys.  The dog, both ducks, and the red, green, and white fish all rattle.  I assume they float as well, but I did not test them.  The yellow fish has a small hole at the top (pictured) and does not rattle.  The bear looks like an old syrup or soap bubble container and is hard plastic with a removable top (not a rattle).
I have seen similar items advertised as Knickerbocker but there are no markings that I can find on these items.
The dog is 4.5" long and 3.5" wide.  The ducks are approx. 3" long, 2.75" tall and 2.25" wide.  The fish are slightly smaller than 2"long and 1.5" wide.  The bear is 5.5" tall and 2,5" wide.
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Condition is "Used". Shipped with USPS First Class.