I don't think there's an offer for this from exchanges to lend you cryptocurrency but they can always help you exchange the one you have for another which is very common through trading, if i may ask for the reason why you wanted to borrow for an investment, it's more better if you don't have a cryptocurrency to learn how you can earn it than borrowing, this shouldn't be your priority to look after because it will not land you well at the end with the experience you will be having with doing so.