You can do this with definite clause grammars (DCGs), which are available in virtually all Prolog systems:

    roo --> zut, pum, tos.

Note the use of (-->)/2 to define a grammar rule. Use phrase/3 to invoke the DCG. DCGs are currently being drafted for inclusion in the Prolog ISO standard:

https://www.complang.tuwien.ac.at/ulrich/iso-prolog/#dcg