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I have heard of people pouring boiling water into/onto the clutch via any available hole to help free frozen clutches - but a trick I have used successfully on cars is to jack up one rear wheel (rear wheel drive) and engage top gear. Then start the engine. Build up revs gradually. Push down the clutch, and then stamp on the brake as if doing an emergency stop. The inertia built up in the transmission is then transferred to the stuck clutch - and a few goes with this technique will often free a clutch up. I feel it is kinder to do this than to drive for real, and then do an emergency stop - although some swear by that technique, too. Obvious stuff - do not do this anywhere except open ground where you have room to stop if the wheel drops off the stand. Do not do this in the workshop! Do not have onlookers. Do not chock any of the three wheels still on the ground. Once the clutch is free, let it slip for a while to smooth off the plates, and to dry out the friction material. HTH
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