Will he make many supplications unto thee? - In the manner of a captive begging for his life. That is, will he quietly submit to you? Prof. Lee supposes that there is an allusion here to the well-known cries of the dolphin when taken; but it is not necessary to suppose such an allusion. The idea is, that the animal here referred to would not tamely submit to his captor.
Will he speak soft words unto thee? - Pleading for his life in tones of tender and plaintive supplication.

Will he make many supplications - There are several allusions in these verses to matters of which we know nothing.

Will he make many supplications unto thee?.... To cease pursuing him, or to let him go when taken, or to use him well and not take away his life; no, he is too spirited and stouthearted to ask any favour, it is below him;
will he speak soft words unto thee? smooth and flattering ones, for the above purposes? he will not: this is a figurative way of speaking.

soft words--that thou mayest spare his life. No: he is untamable.

Supplications - Doth he dread thine anger or power? Or will he earnestly beg thy favour? It is a metaphor from men in distress, who use these means to them to whose power they are subject.