Giving a land speed to creatures

[rediridesence]

So I am running a game, this game takes place in both aquatic and coastal environments.

I know there are ways to give swim speeds and fly speeds /etc to creatures that dont have them. but, is there a way to give a land speed to creatures that don't normally have them?

I am looking for official sources only, not homebrew or third party. Thanks in advance for any help.

[liquidformat]

So I am running a game, this game takes place in both aquatic and coastal environments.

I know there are ways to give swim speeds and fly speeds /etc to creatures that dont have them. but, is there a way to give a land speed to creatures that don't normally have them?

I am looking for official sources only, not homebrew or third party. Thanks in advance for any help.

Fins to feet from spell compendium/stormwrack/savage species is the first to come to mind, expeditious retreat seems reasonable too since it doesn't specify that you have to have a land speed. Also casting mount, or phantom steed gives you transport while on land. Finally you could just get mounts to ride around on land.