Q:My friend may ask this too but here is the scenario: I have a Hovermyr (or any creature just picking random creatures here) and my opponent has a Sage Owl. He/She attacks with said Owl and I declare my Hovermyr as a blocker. However he/she plays a Turn to Frog. Does the attack go through or does the Hovermyr lose it's ability to block the owl?
Nope, still blocks. If it was legal during declare blockers, it stays blocked.