I just finished a game where I had an attacking 7/7 Meteor Golem with trample from Aggressive Mammoth and the guy I was playing against tried to block with 6 Saproling. My question is, can he do that?
Yes. There is normally no limit on how many creatures can block each combat nor is there a limit on how many creatures can block a specific attacker. Some cards may change this by saying creatures can only be blocked by one creature, but the default is "no limit".
509.1a. The defending player chooses which creatures they control, if any, will block. The chosen creatures must be untapped. For each of the chosen creatures, the defending player chooses one creature for it to block that's attacking that player or a planeswalker they control.
Notice that it does not say each creature must block a different attacker.
Notice that it does not say each creature must block a different attacker.