pogo stick
Concise Oxford English Dictionary © 2008 Oxford University Press:
pogo stick/ˈpəʊɡəʊstɪk/
▶noun a toy for jumping about on, consisting of a spring-loaded pole with a handle at the top and rests for the feet near the bottom.
– origin 1920s: of unknown origin.
'pogo stick' also found in these Oxford entries:

