Possible Clues:

• Animal that lives on land and in water
• A measure of speed needed with engineers climbing from Spanish aircraft
• Vehicle for use on land or water
• A suitable vehicle for Kermit?
• One lives on land and in water
• A male getting sign of welcome in lead, Scotsman in versatile vehicle
• For example, a frog in Namibia mutated, acquiring pinkish extremities
• Such as a frog or toad
• Versatile vehicle, one twice separately infringing a speed restriction
• Such as a frog or newt