What kind of pump fits in the front spokes of a Baby Trend Convoy DX? I have tried 5 different ones.
In every country the pumps' brands sold are different, so instead of suggesting some particular type, I would suggest taking your Baby Trend Convoy DX jogger to a bike shop and ask for help there. They will see wheels and advise a pump they have in stock that would fit - they often even try out if unsure themselves.
I want to add that it might not be the fault of the pumps you bought. It's a very budget-oriented pushchair and as such, the details are often not made that well. The problem with a pump valve I encountered with numerous stroller brands -some have badly made valves, some badly made (almost impossible) access to them... So a visit to a bike shop would certainly be what I would do to hear an opinion from someone that is close to the valve to establish its type as well as the state it's in - and help with choosing the right pump if there is such.
Normally, you know, it should be a normal bike pump, really, so I am not sure why that does not fit your stroller.