No, a fusion between Goku and Yamcha would probably make Goku weaker.
But if they fused while Goku was a kid, it might be pretty cool. Goyam or Yamku or Goya (FAIL) lol.
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Yamcha and bulma get together right after goku turns into a great ape in i think ....Episode...... 10
Potara Fusion
Goku
goku's not dead, he just went to other world to fight janemba with pikkon. vegeta is though, because the fusion reborn movie is set when goku has to go back to other world and leave goten and the others to piccolo for fusion training. the movies always change and are not that important to the original anime story.
goku and then piccolo continues to teach them after goku runs out of time on earth and has to go back to the other world.