At the time, abortion was outlined in several medical handbooks that would have been considered standard library. One of them was written by one Benjamin Franklin, so that's one Founding Father right there who literally wrote the book on how to do it.
Abortion was completely unregulated at the time except in Maryland. Legal charges of murder would only arise if the woman would die as part of the procedure, usually by overdose since abortions were most popularly performed by ingesting plant extract. Most religious and legal thought at the time put the "ensoulment" also known as "quickening" of a pregnancy at about 16-22 weeks. The first law to be passed against abortion for women "quick with child" was Connecticut in 1821.
In 1792, there was a case of a woman who everyone assumed *probably* had an abortion but the hard evidence of this needed a real trial to take place before it could really be evaluated seriously. Thomas Jefferson, John Marshall and Patrick Henry advocated AGAINST prosecution. So that's three Founding Fathers debating abortion right there. In the end, the defence somehow managed to convince the court that there never was a pregnancy in the first place so the debate was never settled. (The woman later admitted that she was, in fact, pregnant, but everyone was long done with the case by that point so nothing came of it.) In an interesting side note, the woman later married Gouverneur Morris of New York, who is one of the signers of the Constitution - so that's a fifth Founding Father who decided he was not that fussed about abortion.
I'm sure you'll find more if you dig deeper. But that requires you to actually make the effort to pick up a shovel for yourself.